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John Calvin
UMG22A47_203

John Calvin

Philip Melanchthon
UMG20B49_448

Philip Melanchthon

Soap factory. Mixing process.
UMG20B38_006

Soap factory. Mixing process.

Soap factory. Mixing process.
UMG20B37_348

Soap factory. Mixing process.

Astronomers Measure Star Heat
UMG20A12_410

Astronomers Measure Star Heat