Editore: Triangle Publishing, 1941
Da: H&G Antiquarian Books, Sheboygan, WI, U.S.A.
Hardcover. Condizione: Very Good. No Jacket. brown cloth binding with yellow stamped title on front panel and spine cover, binding tight and square, light spotting and smudges on cover, text clean and unmarked , name of PO in paste down fep illustrated with drawings and photo reproductions of tools and machinery.
Editore: W.C. Brown Company, Dubuque, 1959
Da: H&G Antiquarian Books, Sheboygan, WI, U.S.A.
spiral bound. Condizione: Fine. Grey binding (metal spiral) binding tight and square no damage, text clean and unmarked no names no stamps 12 problem groups.
Editore: Wm. C. Brown Company, Dubuque, 1953
Da: Foliobooks, Madison, WI, U.S.A.
Prima edizione
Hardcover. Condizione: Good. No Jacket. 1st Edition. Text pages are yellowed but free of markings. Endpapers darkened at edges; previous owner's name on front pastedown and small notation on rear pastedown. Boards lightly rubbed at spine; edgels slightly smudged.