Georgeson - Experiments With Corn - paperback or softback - X555z

Georgeson - Experiments With Corn ... - paperback or softback - X555z

Georgeson - Steer-feeding Experiments... - paperback or softback - X555z

Thorne - Field Experiments With Fertilizers... - paperback or softback - X555z

Hopkins - Radium as a Fertilizer - New paperback or softback - X555z

Harper - Fertilizer Experiments With Cotton... - paperback or softback - X555z

Collison - Citrus Fertilizer Experiments - New paperback or softback - - X555z

Mooers - Fertilizer Experiments Volume 63 - paperback or softback - X555z