Dictionaries, Thesauruses, Pictures, and Press Releases
- petrogypsic horizon
- petrogypsic horizon
- petrogypsic horizon
- petroleum geology
- petrological microscope
- Petromyidae
- Petromys typicus
- Petromyzonidae
- Petromyzoniformes
- Petronia
- petrophilous
- petrophysics
- petrosal
- Petrov, Nikolay Pavlovich
- Petrov, Vasily Vladimirovich
- Petrovsky, Ivan Georgievich
- Petrus Bonus,also known as Bonus Lombardus or Buono Lombardo of Ferrara
- Pettenkofer, Max Josef von
- Petterssen, Sverre
- Pettersson, Hans