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1441
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1442
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1443
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1444
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1445
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1446
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1447
Manual for mechanical drawing in elementary schools, with suggestions to teachers.
Julkaistu 1928Kirja -
1448
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1449
Good practice in construction by P. G. Knobloch, with a preface by Thomas Hastings
Julkaistu 1923Kirja -
1450