Fe3C is also known as cohenite, particularly when found mixed with nickel and cobalt carbides in meteorites. This form, a hard, shiny silver mineral, was first described by E. Weinschenk[?] in 1889.
Prokhorov, Aleksandr Mikhailovich[?] [?]
Proof of angular momentum [?]
Proper time[?] [?]
Prout, William ...
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