A vast number of books, monographs and reference works on physics, mathematics, philosophy and history of science compose the collection. There are thousands of reprints of original papers autographed by their authors. The manuscripts of hundreds of published and unpublished books, papers, and lectures from physicists, mathematicians, philosophers, and literati are in the collection.

Dr. Mehra's research in the history of 20th century physics has produced taped interviews with many famous scientists. The tapes compile discussions on physics, astrophysics, cosmology, quantum mechanics and quantum physics. Those interviewed include P.A.M. Dirac, W. Heisenberg, Richard Feynman, Julian Schwinger, Willis E. Lamb Jr., Murray Gell-Mann and numerous other Nobel Laureates and distinguished scientists. Other tapes record speeches by many Nobel Prize winners in physics. The information in these oral histories is unique.