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Place
- New York (State)--New York44
- Indiana--Indianapolis38
- England--London19
- New York (State)17
- Germany15
- Germany--Karlsruhe13
- Germany--Berlin11
- Sweden--Stockholm10
- Germany--Heidelberg8
- Kungl. Lantbruksakademien (Sweden). Experimentalfältet8
- Germany--Leipzig7
- Massachusetts--Cambridge4
- Pennsylvania--Bridgeville4
- Delaware--Wilmington3
- Illinois--Chicago3
- New Jersey3
- New Jersey--Kenvil3
- England--Barlaston2
- England--Stoke-on-Trent2
- Germany--Frankfurt am Main2