The Astrochemist
ARS cryo
Cryomech
Cryovac
ICE Oxford
JANIS
Lakeshore
Oxford Cryosystems
Oxford Instruments NANOSCIENCE
SHI cryogenic
My Cryo Firm
Absolute Systems
Agilent
Edwards
MKS Newport
Pfeiffer
Brooks
Thyracont
Leybold
Neyco
Kurt Lesker
www.colby.edu/chemistry/PChem/Hartree.html
halas.rice.edu/conversions
www.unit-conversion.info/pressure.html
NIST WebBook
SDBS Database
HITRAN Database
SigmaAldrich SpectraBase