His name should be spelled "normally" -- E. E. Cummings -- not e. e. cummings. See http://www.gvsu.edu/english/cummings/caps.htm.
Below is a list of his published books (I think this list is complete. Any experts?).
Eight Harvard Poets, 1917
The Enormous Room, New York, 1922
Tulips and Chimneys, New York 1923
&, 1925
XLI Poems, 1925
Is 5,1926
Him, 1927
{No Title}, 1930
CIOPW, 1931
ViVa??, 1931
Eimi, 1933
No Thanks, 1935
Tom, 1935
Collected Poems, 1938
50 Poems, 1940
1 x 1, 1944
Santa Claus, 1946
Xaipe, 1950
I: six nonlectures, 1953
Poems 1923-1954, 1954
95 Poems, 1958
73 Poems, 1963