Hulst, H. C. van de (Hendrik Christoffel), 1918- The development of 21cm radio astronomy [sound recording] / 1969 July.

Hulst, H. C. van de (Hendrik Christoffel), 1918-

The development of 21cm radio astronomy [sound recording] / 1969 July.

Radio astronomy.

Sound recordings lcgft

American Institute of Physics.

AIP-ICOS

American Institute of Physics. Niels Bohr Library & Archives. One Physics Ellipse, College Park, MD 20740, USA