15 



Blake, tau Pfcippe* cent f d 



75. 1905 gg Superficial Blackening end Disco lor at ion 



Hocks, ea-pe cially in Deert Regions* Trims. 



A&*r . Iiig t . Min . Kngr s . , tol * 35 , pp S71-S7S 



;"j '' ,, .: - . '; . ' ; " ' " '\ >;.'" 



1905. Discussion by Coratock, Theo.B., 

 . pp. 1014*101?* 



76. 1906 hi* Origin of the Depression Known ae 



Wall, Arizona* Soiiinoe, n > vol. 34, |>.568 

 1906* 



flanking Butrital Slopes of th Mountfiina 

 of the SoutliwtBt. Science, n.s.,vcl.?5, 

 pp.075-978, June SI, 1907. Ibatr. ,Fbb.33,p.S94. 



Destruction of the Salt Works in the Colorado 

 by ths Smlton 8ea Bi-Month.^ill* 



Min*!agr, no.l9,pp.81-83 f Jan* 

 1908; Trass., vol38 

 (1907) 



79. 1908 kk Qo logical Sketoh of the Begion of fuo&on, 



Arizona. In MacDougal, "Botanical Features 

 of Horth American Deserts, 11 Carnegie Inat. 

 of &*hington Ptibl., no. 90 1 pp. 45-68, pi. 6a 

 (mep), 1908. 



fh Geological Mineral Beaouroee of Pima 

 Ootaity . 4r|sont Pajlly it^rr Indtist r iml 

 Hid- Winter number, pp. 86 -37 t 1909. 



