19 books
Thirty-Fifth Quarterly Report of the Pennsylvania Board of Agriculture, 1887 (Classic Reprint)
Thirty-First Quarterly Report of the Pennsylvania Board of Agriculture, 1886 (Classic Reprint)
Thirty-Fourth Quarterly Report of the Pennsylvania Board of Agriculture, 1887 (Classic Reprint)
First Annual Report of Dr. F. A. Genth, Chemist of the Pennsylvania Board of Agriculture, 1878