Beskrivelse
Udgivet:16th ed.-
Emne beskrivelse:Published: Gaitherburg, Md., <1998->
Fysisk beskrivelse:volumes (loose-leaf) : illustrations ; 30 cm
Also issued on CD-ROM.
Udgivelsesfrekvens:Quinquennial, with annual supplements
ISSN:1546-4121
0066-961X