A limnological study of Hydra oligactis in Douglas Lake, Michigan /
Welch, Paul S.
A limnological study of Hydra oligactis in Douglas Lake, Michigan / by Paul S. Welch and Helen A. Loomis - [S.l. : s.n.], 1924 - 203-235 p. ; 24 cm. - Transactions of the American Microscopical Society ; 43 .
A limnological study of Hydra oligactis in Douglas Lake, Michigan / by Paul S. Welch and Helen A. Loomis - [S.l. : s.n.], 1924 - 203-235 p. ; 24 cm. - Transactions of the American Microscopical Society ; 43 .