The Ohio Agricultural Experiment Station /

Mode of access: Internet.

Bulletin - California Agricultural Experiment Station.

No. 11-77 have leaves varying in size from 31 x 17 cm. to 64 x 18 cm.

Technical bulletin - Michigan Agricultural Experiment Station (East Lansing).

Includes tables.

Bulletin / Washington (State) Agricultural Experiment Station, Pullman.

Mode of access: Internet.

Fertilizer report. Agricultural Experiment Station of the Louisiana State University and A. & M. College

Mode of access: Internet.

Technical series / Colorado Agricultural Experiment Station.

Mode of access: Internet.

Publications of the Maine Agricultural Experiment Station.

Mode of access: Internet.

Bulletin / Arkansas Agricultural Experiment Station at Arkansas Industrial University.

Mode of access: Internet.

Report. California. Agricultural Experiment Station. Berkeley.

Mode of access: Internet.

Research bulletin / University of Missouri, College of Agriculture, Agricultural Experiment Station.

Mode of access: Internet.

Annual report of the Jorhat Agricultural Experiment Station.

Mode of access: Internet.

Circular - Utah Agricultural Experiment Station, Utah State Agricultural College.

Mode of access: Internet.

Bulletin - Agricultural Experiment Station, University of Minnesota.

Mode of access: Internet.

Bulletin - Agricultural Experiment Station, North Carolina State College.

Bulletins no. 1-56 appeared in the columns of the Bulletin of the North Carolina Dept. of Agriculture.

Memoir - Cornell University Agricultural Experiment Station.

"A publication of the New York State College of Agriculture, a unit of the State University of New York, at Cornell University."