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	1.	Directed studies in general agriculture, an outline course with complete references for use in schools, by Douglas Francis Dickerson and Gilbeart H. Collings. by Dickerson, Douglas Francis, 1882- Collings, Gilbeart H. (Gilbeart Hooper), 1895-1964 [joint author.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: [Grand Rapids, Minn., Grand Rapids herald-review, c1944] Availability: No items available. Add to cart (remove)
	2.	Commercial fertilizers, their sources and use. by Collings, Gilbeart H. (Gilbeart Hooper), 1895-1964 Series: Blakiston books on agriculture Edition: 4th ed. Material type: Text; Format: print ; Literary form: Not fiction Publication details: Philadelphia [1947] Availability: No items available. Add to cart (remove)

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