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array(13) {
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  string(44) "yv3AmHThFV7vKLrNAdChLebzzkz+WpF+jl0uh301w4QQ"
  ["606afc60e344167b99134a7b8c22ce5b-page"]=>
  string(4) "iw=="
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}

American men of science : a biographical directory - 10th ed. (1960-1961); v. 03

int(0)
array(13) {
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  ["606afc60e344167b99134a7b8c22ce5b-page"]=>
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}

American men of science : a biographical directory - 10th ed. (1960-1961); v. 05

int(0)
array(13) {
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American men of science : a biographical directory - 10th ed. (1960-1961); v. 02

int(0)
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American men of science : a biographical directory - 10th ed. (1960-1961); v. 01