.245
a	Ecology and distribution of major diatom ecotypes in the southern fort union coal region of Montana.
h	Book
.100
a	BAHLS, L.L.
.005
a	20080212143148
.260
a	Washington
b	United States Goverment
c	1984
.084
a	589.481 BAH
.300
a	151 hlm.: gamb.
b	28 cm.
c	151 hlm.: gamb.; 28 cm.
.490
a	Geological survey professional paper 1289
.336
a	Book