@misc{Breckenridge_William_Edwin_(1869-_)._The,
 author={Breckenridge, William Edwin (1869- ).},
 howpublished={online},
 publisher={Keuffel & Esser},
 language={eng},
 type={książka},
 type={dokument piśmienniczy},
 title={The log log duplex slide rule : a self teaching manual with tables of settings equivalents and gauge points},
}