Duplicate twins and double monsters

[1] ADOLPH, 1894, THESIS MARBURG

[2] AILFELD, 1880, MISSBILDUNGEN MENSCH

[3] ALEXANDER, 1899, ARCH ENTWICKELUNGSME, V8

[4] ALLIX, 1867, ANN SCI NAT, V8

[5] ALLIX, 1868, ANN SCI NAT, V9

[6] BALL, 1894, THESIS HEIDELBERG

[7] BALLANTYNE, 1895, TERATOLOTIA, V12

[8] BALLANTYNE, TERATOLOGIA

[9] BALLANTYNE, EDINB MED J

[10] BARBOUR, 1888, AM J SCI, V36

[1] ADOLPH, 1894, THESIS MARBURG

[2] AILFELD, 1880, MISSBILDUNGEN MENSCH

[3] ALEXANDER, 1899, ARCH ENTWICKELUNGSME, V8

[4] ALLIX, 1867, ANN SCI NAT, V8

[5] ALLIX, 1868, ANN SCI NAT, V9

[6] BALL, 1894, THESIS HEIDELBERG

[7] BALLANTYNE, 1895, TERATOLOTIA, V12

[8] BALLANTYNE, TERATOLOGIA

[9] BALLANTYNE, EDINB MED J

[10] BARBOUR, 1888, AM J SCI, V36