000 00278 a2200109 4500
008 190220b xxu||||| |||| 00| 0
100 _aWelch P. S.
245 _aLimnology /
_cP. S. Welch
260 _aNewYork
_bMcGraw-Hill Book Company, Inc.
_c1952
300 _a538p.
942 _2ddc
_cBK
999 _c8708
_d8708