Commercial production records 36 4 

 purification plants 619 

 quahog harvest 861, 1282 



quantities 35, 56, 337, 413 



scale 505, 1888 



seed production 667 



transplanting 1918 



season, beginning and end of 1584 



shellfish 270, 416, 1577 



areas 1832 



cleansing plant 1225 



growing areas 357 



hatcheries 591, 1296 



licenses 417 



shellfisheries 188, 467 



size 493, 495 



species 497 



sugar 272 



traits, superior 1291 



use 540 



value 505 



vessels 467 



Commercially important 320, 488 



valuable 691, 1312 



Commissures, buccal 782 



, labial 782 



Committee on Merchant Marine and Fisheries 375 



Common 781 



names 2, 899 



Communities 21, 472, 2005 



animal 1397 



epifaunal 517 



in contact 211 



indicator 1948 



littoral 1186 



Community, Arctic 1801, 1802, 1804 



composition 1944 



diversity, lowered 2232 



, mud 1207 



patterns 1199 



, soft-bottom 1610 



structure 175, 2003, 2028, 2232 



trophic structure 1539 



Comparative study 370 



Compass and chain 490 



Competing species and enemies, free from 1787 



Competition 87, 99, 797, 1123, 1282 



664 



