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Full-text documents may be available online from Texas Tech University's Virtual Vietnam Archive.

Learn more about the project: Lam, Vinh-The, and Darryl Friesen. "A Web-based Database of CIA Declassified Documents on the Vietnam War." Online 28, no. 4 (2004): 31-35.

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19 documents contain the indexing term NORTH VIETNAMESE FORCES IN SOUTH VIETNAM
ID Document
01173 Analysis of the Vietnamese Communists' strengths, capabilities, and will to persist in their present strategy in Vietnam. Annex IV: The ground war in South Vietnam (August 26, 1966)
Report; NOT GIVEN; ORIGINAL
00554 Buildup of Vietnamese Communist forces continues after resumption of air attacks (February 21, 1966)
Intelligence memorandum; TOP SECRET; SANITIZED
Declassified: February 20, 1981
00678 CIA Director Richard Helms informs Johnson ... (May 24, 1968)
Memorandum; TOP SECRET; ORIGINAL
Declassified: May 7, 1984
00685 CIA study on North Vietnamese manpower (May 24, 1968)
Memorandum; TOP SECRET; ORIGINAL
Declassified: June 25, 1984
00726 Construction and logistic activities in the Khe Sanh area (February 7, 1968)
Intelligence memorandum; SECRET; SANITIZED
00557 Current status of PAVN infiltration to South Vietnam (April 9, 1966)
Intelligence memorandum; TOP SECRET; SANITIZED
Declassified: February 20, 1981
00663 Current status of PAVN infiltration to South Vietnam (April 11, 1966)
Intelligence memorandum; TOP SECRET; SANITIZED
Declassified: July 5, 1984
00216 Current strength of the North Vietnamese Army (December 8, 1965)
Office of Current Intelligence memorandum; TOP SECRET; SANITIZED
Declassified: November 22, 1976
00677 Enemy threat to Khe Sanh (January 11, 1968)
Cable; NOT GIVEN; SANITIZED
Declassified: October 30, 1984
00725 Enemy threat to Khe Sanh (January 10, 1968)
Intelligence memorandum; SECRET; SANITIZED
Declassified: July 25, 1985
00669 Growing strength of North Vietnamese Army forces in South Vietnam (March 26, 1968)
Memorandum; TOP SECRET; SANITIZED
Declassified: July 5, 1984
01205 Growing strength of North Vietnamese Army forces in South Vietnam (March 26, 1968)
Memorandum; NOT GIVEN; SANITIZED
Declassified: December 22, 1989
00673 Infiltration figures for 1966 (January 31, 1967)
Memorandum; SECRET; ORIGINAL
Declassified: May 7, 1984
00680 Reassessment of the number of North Vietnamese troops in South Vietnam (1968)
Memorandum; SECRET; ORIGINAL
Declassified: May 7, 1984
00738 Situation in the provinces of IV Corps as of 1300 hours on 14 March 1968 (March 14, 1968)
Cable; NOT GIVEN; SANITIZED
Declassified: January 30, 1987
00170 Situation in Vietnam (April 9, 1965)
Special DCI briefing; NOT GIVEN; SANITIZED
Declassified: September 7, 1976
00662 Status of PAVN infiltration to South Vietnam (January 11, 1966)
Intelligence memorandum; TOP SECRET; SANITIZED
Declassified: July 5, 1984
01183 Vietnam situation : an analysis and estimate. Chapter II: The enemy forces in the South (May 23, 1967)
Report; NOT GIVEN; ORIGINAL
00464 Vietnamese Communists will to persist (August 26, 1966)
Memorandum; SECRET; ORIGINAL
Declassified: October 19, 1983