Magic; stage illusions and scientific diversionsHopkins, Albert Allis · First published 1967Open the Tome
The standard American encyclopedia of formulasHopkins, Albert Allis · First published 1953Open the Tome
The Scientific American cyclopedia of formulasHopkins, Albert Allis · First published 1910 · Latest edition 1925Open the Tome
Scientific American handy book of facts and formulaeAlbert A. Hopkins · First published 1921Open the Tome
Scientific American reference bookHopkins, Albert Allis · First published 1877 · Latest edition 1905Open the Tome