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thereof in the Federal Register, together with ap- 

 propriate maps and descriptions: Provided, That in 

 selecting the rights-of-way full consideration shall 

 be given to minimizing the adverse effects upon the 

 adjacent landowner or user and his operation. De- 

 velopment and management of each segment of the 

 National Trails System shall be designed to harmo- 

 nize with and complement any established multiple- 

 use plans for that specific area in order to insure 

 continued maximum benefits from the land. The 

 location and width of such rights-of-way across 

 Federal lands under the jurisdiction of another 

 Federal agency shall be by agreement between the 

 head of that agency and the appropriate Secretary. 

 In selecting rights-of-way for trail purposes, the 

 Secretary shall obtain the advice and assistance of 

 the States, local governments, private organizations, 

 and landowners and land users concerned. 



(b) Relocation of segment of national scenic trail 

 right-of-way; determination of necessity with offi- 

 cial having jurisdiction; necessity for Act of 

 Congress. 



After publication of notice in the Federal Register, 

 together with appropriate maps and descriptions, 

 the Secretary charged with the administration of 

 a national scenic trail may relocate segments of a 

 national scenic trail right-of-way. with the concur- 

 rence of the head of the Federal agency having 

 jurisdiction over the lands involved, upon a determi- 

 nation that: (1) such a relocation is necessary to 

 preserve the purposes for which the trail was es- 

 tablished, or (ii) the relocation is necessary to 

 promote a sound land management program in ac- 

 cordance with established multiple-use principles: 

 Provided, That a substantial relocation of the rights- 

 of-way for such trail shall be by Act of Congress. 



(c) Facilities on national scenic trails; permissible 

 activities; use of motorized vehicles; establish- 

 ment of uniform marker; placement of uniform 

 markers. 



National scenic trails may contain campsites, 

 shelters, and related-public-use facilities. Other uses 

 along the trail, which will not substantially interfere 

 with the nature and purposes of the trail, may be 

 permitted by the Secretary charged with the ad- 

 ministration of the trail. Reasonable efforts shall be 

 made to provide sufficient access opportunities to 

 such trails and. to the extent practicable, efforts 

 shall be made to avoid activities incompatible with 

 the purposes for which such trails were established. 

 The use of motorized vehicles by the general public 

 along any national scenic trail shall be prohibited 

 and nothing in this chapter shall be construed as 

 authorizing the use of motorized vehicles within 

 the natural and historical areas of the national park 

 system, the national wildlife refuge system, the na- 

 tional wilderness preservation system where they 

 are presently prohibited or on other Federal lands 

 where trails are designated as being closed to such 

 use by the appropriate Secretary : Provided, That 

 the Secretary charged with the administration of 

 such trail shall establish regulations which shall 

 authorize the use of motorized vehicles when, in his 

 judgment, such vehicles are necessary to meet 

 emergencies or to enable adjacent landowners or 



land users to have reasonable access to their lands or 

 timber rights: Provided further. That private lands 

 included in the national recreation or scenic trails 

 by cooperative agreement of a landowner shall not 

 preclude such owner from using motorized vehicles 

 on or across such trails or adjacent lands from time 

 to time in accordance with regulations to be estab- 

 lished by the appropriate Secretary. The Secretary 

 of the Interior and the Secretary of Agriculture, in 

 consultation with appropriate governmental agen- 

 cies and public and private organizations, shall es- 

 tablish a uniform marker, including thereon an ap- 

 propriate and distinctive symbol for each national 

 recreation and scenic trail. Where the trails cross 

 lands administered by Federal agencies such mark- 

 ers shall be erected at appropriate points along the 

 trails and maintained by the Federal agency ad- 

 ministering the trail in accordance with standards 

 established by the appropriate Secretary and vHiere 

 the trails cross non-Federal lands, in accordance 

 with written cooperative agreements, the appropri- 

 ate Secretary shall provide such uniform markers to 

 cooperating agencies and shall require such agencies 

 to erect and maintain them in accordance with the 

 standards established. 



(d) Use and acquisition of lands within exterior 

 boundaries of areas included in right-of-way; 

 acreage limitations. 



Within the exterior boundaries of areas under 

 their administration that are included in the right- 

 of-way selected for a national recreation or scenic 

 trail, the heads of Federal agencies may use lands 

 for trail purposes and may acquire lands or interests 

 in lands by written cooperative agreement, donation, 

 purchase with donated or appropriated funds or ex- 

 change: Provided, That not more than twenty-five 

 acres in any one mile may be acquired without the 

 consent of the owner. 



(e) Right-of-way lands outside exterior boundaries of 

 federally administered areas; cooperative agree- 

 ments or acquisition; failure to agree or acquire; 

 agreement or acquisition by Secretary concerned; 

 right of first refusal for original owner upon 

 disposal. 



Where the lands included in a national trail right- 

 of-way are outside of the exterior boundaries of 

 federally administered areas, the Secretary charged 

 with the administration of such trail shall encour- 

 age the States or local governments involved (1) to 

 enter into written cooperative agreements with land- 

 owners, private organizations, and individuals to 

 provide the necessary trail right-of-way, or (2) to 

 acquire such lands or interests therein to be utilized 

 as segments of the national scenic trail: Provided, 

 That if the State or local governments fail to enter 

 into such written cooperative agreements or to ac- 

 quire such lands or interests therein within two years 

 after notice of the selection of the right-of-way is 

 published, the appropriate Secretary may (ii enter 

 into such agreements with landowners. States, local 

 governments, private organizations, and individuals 

 for the use of lands for trail purposes, or (ii> accuire 

 private lands or interests therein by donation, pur- 

 chase with donated or appropriated funds or ex- 

 change in accordance with the provisions of subsec- 

 tion (g) of this section. The lands involved in such 



