Submarines carry white mice because they are susceptible to the presence of poisonous gases. When they become sleepy and lethargic it shows the air has become dangerous for human beings and the submarine is brought to the
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Bibliographic details
Manawatu Times, Volume LV, Issue 6839, 21 April 1932, Page 9
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37Page 9 Advertisements Column 3 Manawatu Times, Volume LV, Issue 6839, 21 April 1932, Page 9
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