Archive image from page 369 of Department bulletin (1923-1929). Department bulletin departmentbul11261150unit Year: 1923-1929. Jul. 1136. U. S. Dept. of Agriculture. Plate II. wa â i i Fig. I.âHeater Unit for External Blower.

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Keywords: 1920, 1923-1929, archive, book, bookauthor, bookdecade, bookpublisher, bookyear, drawing, historical, history, illustration, image, page, picture, print, reference, united_states_dept_of_agriculture, vintage, washington_d_c_the_dept_supt_of_docs_g_p_o_