William G. Holzberger
Interpretations of Poetry and Religion- Letters of George Santayana
- Letters of George Santayana, 1910-1920
- Letters of George Santayana, 1910-1920 Bk. 2, Vol. V
- Letters of George Santayana, 1921 1927 Vol. V, Bk. 3
- Letters of George Santayana, 1921-1927
- Letters of George Santayana, 1928-1932
- Letters of George Santayana, 1933-1936
- Letters of George Santayana, 1937-1940
- Letters of George Santayana, 1941-1947
- Letters of George Santayana, 1948-1952
- Letters of George Santayana, Book Eight, 1948-1952