Container / Location		Title
		Series 1. General correspondence [series]: General correspondence is divided into two subseries:-subseries 1. A chronological arrangement of general correspondence.-subseries 2. Correspondence of a particular topic arranged chronologically.
		Subseries Ia. General Correspondence Arranged Chronologically [subseries]:
1		1902-1914
1		1915
1		1916-1917
1		1918, 1921
1		1922-1924
1		1926-1929
1		1930
1		1931-1932
1		1933-1934
1		1935
1		1936
1		1937
1		1938
1		1939
1		1940
1		1941
1		1942
1		Jan. 1943-Mar. 1943
1		Apr. 1943-May 1943
1		June 1943-Dec. 1943
1		1944, and undated
		Subseries Ib. Correspondence of a particular topic arranged chronologically [subseries]:
74		Letters from Van Loon to the Netherlands commenting on wartime in America. Photocopies
2		Letters from reviewers about Hendrik Willem van Loon's Fall of the Dutch Republic, 1912-1914
2		Letters of introduction, 1913-1916
2		Correspondence pertaining to a job with the University of Wisconsin, 1914
2		Correspondence to Mr. Zuberbuehler (about Willem's schooling), 1926-1929
2		Correspondence concerning a debate that Verdi Alien was trying to set up that centered about Darwinian theories, 1937
2		Correspondence about Queen Wilhelmina's knighting of Hendrik Willem van Loon, 1937
2		Congratulation telegrams on Hendrik Willem van Loon's 60th Birthday (A-M, N-Z, Misc.) includes telegrams from H. Kerster and the Netherlands, 1942
2		Congratulation letters on Hendrik Willem van Loon's 60th Birthday (A-M, N-W, Misc.), 1942
2		Correspondence about Van Loon's Lives, 1942
2		Correspondence about a pamphlet for the state of Connecticut, 1943
2		Correspondence from World War II soldiers, 1943
2		War Relief correspondence, June 1941 - July 1941
2		War Relief correspondence, Aug. 1943-Jan. 1944
3		Condolence telegrams (A-H, J-M, P-Z, Misc.), 1944
3		Condolence letters(A, B, C, D-E, F, G, H, J, K, L M, N-0, P, R, S, T,V, W-Z, Misc.), 1944
3		Letters after Hendrik's death, 1944-1962