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Wilbur S. Jackman

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Number Work in Nature Study, Part 1
Outlines of Natural Science for the Common Schools (Classic Reprint)
Outlines of Natural Science for the Common Schools (Classic Reprint)
Outlines of Natural Science for the Common Schools, Pp. 45-101
Outlines of Natural Science for the Common Schools; Pp. 45-101
Nature Study For The Common Schools (1892)
Number Work in Nature Study
Field Work in Nature Study A Hand-Book for Teachers and Pupils