Got this response from another list:

Check on Abebooks.com (http://www.abebooks.com/)

Here is the listing from one bookseller who has a copy:

"Skalnate Pleso Atlas of the Heavens"

Becvar, A.

$125.00

Description: Book Description: Cambridge, Mass: Sky Publishing Corp., 1969.
FIRST EDITION THUS. 16 Star Charts in an oblong folio format (approx 18" x
12" each). All in Very Good Plus Condition. Loose Black Charts printed on
heavy card stock. Includes 16 star charts covering the entire sky from the
North Pole to the South Pole. Symbol key to the atlas and index to
constellations. "Skalnate Pleso Atlas of the Heavens 1950.0". Bookseller
Inventory # B-hja-0129051

Another seller has an ex-library copy for $107.00.

Good luck.

Robert A. Garfinkle, F.R.A.S.
32924 Monrovia Street
Union City, CA 94587 USA
E-mail: ragarf@earthlink.net