Close at low tide 1176 



shell 101 



to shore 1552 



valves completely 489, 642, 1664 



Closed acreage in Nassau County, N. Y. 1328 



areas 357, 505, 1196 



, new each year 1447 



_____ by pollution 357, 493, 518, 549, 1197 



clam beds again 518, 1196 



clamming areas 518, 1656 



-cycle 172, 1513, 1712, 2021 



grounds 504 



, opening of 1214 



heat exchangers 1227 

 hermetically 523 

 quahogs used no 2 1322 

 recirculating system 1414 

 , remain 1804 

 seasons 548, 947 



shellfish areas 106, 148, 149, 606, 1180, 1366, 1887 



system 248, 1224, 1498, 1707, 2051 

 to clamming 244, 246, 400, 1447, 1997, 2089 

 harvesting 886, 1448 



shellfishing 549, 1216, 1395, 2004, 2071 



Venus mevcenaria 521 



Closing of areas in New York Bight 189 3 

 Closure, loss caused by 1921 



of beds 15, 35, 46, 140, 305, 356, 910, 1216 



necessary for only 2 or 3 months each year 1859 



markets 1310 



polluted areas 1214 



Raritan Bay to clamming 484 



, period of 403 



, sustained tonic 1664 



Closures, bay 2032 

 Cloth, hardware 30 2 

 Clusters dispersed 731 



, irregular 731 



Coal fly-ash 2197 



-_ not a hazard 2197 



particles 2041 



Coast, northeast 2180 

 Coastal development 17 81 



ecosystems 923 



Plains Regional Commission 1856 



zone, competition for use of 1369 



Resources, Inc., N. C. 540, 1856 



661 



