00560cam a22002171 4500 ca 35000023 DLC 20260227111136.0 900118s1934 nyu 000 0 eng ca 35000023 (OCoLC)20922965 DLC NSbSU DLC premarc T212 .G65 Gross, David. "Gold in your backyard", by David Gross ... New York, N.Y., Isaac Goldmann company, 1934. 48 p. 21 cm. Inventions. Success. 17736 17736