Birthday Letters was created in 1998.
We Get Letters was created in 1957-09.
Letters From My Windmill was created in 1869.
Electronics Letters was created in 1965.
FEBS Letters was created in 1968.
Cancer Letters was created in 1975.
Letters to Laugh-In was created in 1969.
Nano Letters was created in 2001.
Physics Letters was created in 1962.
Migration Letters was created in 2004.
Letters of Insurgents was created in 1976.
Biology Letters was created in 2005.
The Yage Letters was created in 1963.