“Engineers did not discover insulation: they copied it from these old soldiers of the prairie war.”

— Aldo Leopold, book A Sand County Almanac

“April: Bur Oak”, p. 27.
A Sand County Almanac, 1949, "April: Come High Water," "April: Draba," "April: Bur Oak," & "April:Sky Dance"

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Aldo Leopold130

American writer and scientist 1887–1948

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