Frequency standards and clocks : a tutorial introduction - Washington : U.S. Department of Commerce ; 1977 - v,64p. : ill.; 27 cm. - NBS technical note; no.616. .

2 nd revision

Subjects--Topical Terms:
Atomic clocks.
Atomic frequency standards.

Dewey Class. No.: US 539.14 / Un 31(no.616/1977)