Developments in Countries of Eastern Europe._ Washington: GPO, 1970.

U.S. Department of Agriculture. Economic Research Service. _The
Agricultural Economy and Trade of Bulgaria._ (Bulletin ERS-Foreign
256.) Washington: GPO, February 1969.

U.S. Department of the Interior. Bureau of Mines. "The Mineral
Industry of Bulgaria." Washington: GPO, n.d. (Preprint from _1971
Bureau of Mines Minerals Yearbook_.)

Wilczynski, J. _Socialist Economic Development and Reforms._ New York:
Praeger, 1972.

_Yearbook of National Account Statistics, 1971._ New York: United
Nations, 1973.

Section IV. National Security

Baldwin, Godfrey (ed.). _International Population Reports._ (U.S.
Department of Commerce, Series p-91, No. 18.) Washington: GPO,
1969.

Bulgaria. State Information Office with the Council of Ministers.
_Statistical Pocket Book 1970._ Sofia: Sofia Press, 1970.

Cary, William. _Bulgaria Today._ New York: Exposition Press, 1965.

Dellin, L. A. D. (ed.) _Bulgaria: East-Central Europe Under the
Communists._ New York: Praeger, 1957.

_The Military Balance, 1972-73._ London: Institute for Strategic
Studies, 1972.

Newman, Bernard. _Bulgarian Background._ London: Robert Hale, 1961.

Oren, Nissan. _Bulgarian Communism._ New York: Columbia University
Press, 1971.

Perl, Lila. _Yugoslavia, Romania, Bulgaria._ Camden: Thomas Nelson,
1970.

Popoff, Emil. "Bulgaria's Young: The Silent Nihilists," _East Europe_,
XVII, No. 7, July 1968, 7-11.

Pounds, Norman J. G. _Eastern Europe._ Chicago: Aldine, 1969.

Rothschild, Joseph. _Communist Eastern Europe._ New York: Walker,
1964.

U.S. Department of Commerce. Office of Technical Services. Joint
Publications Research Service--JPRS (Washington). The following
items are from the JPRS series _Translations on Eastern Europe:
Political, Sociological, and Military Affairs_.

"Bulgarian Criminal Code," _Sbornik postanovleniya i
razporezhdaniya na Ministerskiya suvet na NRB_, Sofia, May 1968.
(JPRS: 45,757, No. 5, 1968).

"Bulgarian Customs Operations," _Otechestven Front_, Sofia, 1971,
(JPRS: 55,110, No. 475, 1972).

"Civil Defense Plans and Tasks," _Narodna Armiya_, Sofia, February
21, 1972. (JPRS: 58,495, No. 685, 1973).

"Crime Treatment in Socialist Society," _Filosofska Misul_, Sofia,
1971. (JPRS: 53,920, No. 405, 1971)