351.
352.
Agricultural Bacteriology: a Study of the Relation of Bacteria to Agriculture, with Special ...
by Conn, Herbert William
ISBN: 9781021611185
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Introductory Physiology and Hygiene: for Use in Primary Grades
by Conn, Herbert William
ISBN: 9781022774902
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Introductory Physiology and Hygiene: for Use in Primary Grades
by Conn, Herbert William
ISBN: 9781020657535
357.
Agricultural Bacteriology; a Study of the Relation of Germ Life to the Farm, with Laboratory...
by Conn, H. J. (harold Joel) 1...
ISBN: 9781013426285