CHRISTIAN HENRY FREDERICK PETERS. solar spots making a record of nearly 14000 spots but CHRISTIAN HENRY FREDERICK PETERS. A JET-PROPELLED STEAM LIFEBOAT., scientific american, 1890-09-06
CHRISTIAN HENRY FREDERICK PETERS. solar spots making a record of nearly 14000 spots but CHRISTIAN HENRY FREDERICK PETERS. A JET-PROPELLED STEAM LIFEBOAT., scientific american, 1890-09-06
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