Positions of optical objects in the fields of 42 radio sources

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Abstract
The positions of the optical objects which may be associated with a number of discrete sources of radio emission have been determined to an accuracy of one-third to one-half of a second of arc by reference to nearby Yale Zone or AGK2 stars. Where possible, this has been done in two stages: the positions of faint stars within a few minutes of arc of the radio source have been measured, using the 48-inch Palomar Schmidt, and the faint stars have been used in turn to provide reference positions on photographs taken with the 200-inch reflector.

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