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Frances Martin, Ida Black - 1960
"Angel Mounds - Misc. / Kodacolor Negative / Mrs. George Martin holding Proton Magnetometer sensing head along a non-magnetic tape to take readings of the earth's magnetism at one-foot intervals in Subdivision P-9-D. / Mrs. G. A. Black holding…
Ida Black with magenetometry van
Ida Black standing in front of the magenetometry van at Angel Mounds.