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In pencil: lower left, Construction in Space; signed lower right, Karl Baumann 40; upper left (verso), Calif/Karl Baumann/Litho; blind stamped: lower left, WPA/-RT/---JECT
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In pencil: lower left, Construction in Space; signed lower right, Karl Baumann 40; upper left (verso), Calif/Karl Baumann/Litho; blind stamped: lower left, WPA/-RT/---JECT