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Harm Kamerlingh Onnes, c. 1936, drawing, RP-T-1994-124(R)
Schmidt-Degener
Harm Kamerlingh Onnes, 1936, drawing, RP-T-1994-126
Harm Kamerlingh Onnes, c. 1936, drawing, RP-T-1994-124(R)
Harm Kamerlingh Onnes, 1936, drawing, RP-T-1994-126