This is somewhat redundant with Igor Pak's P.S., but I found an index for the 1918-1950 range in *The Otto Dunkel memorial problem book*, starting on page 80 of [this pdf][1]. ---------- I found more: Stanley Rabinowitz and others had the same idea a couple of decades ago, and they started compiling indices, not just for the *Monthly*. Here are Google Books links for the two volumes I could find: [1975-1979][2] (published 1999) [1980-1984][3] (published 1992) Googling "Stanley Rabinowitz 1985-1989" led me to [this][4]: > The labor involved in classifying and indexing the 5-year indexes has proved to be far greater than anticipated. We hope to have the 1975-1979 Index out later this year and the 1985-1989 Index is well under way. [Stanley Rabinowitz, June 1996] I don't know if the 1985-1989 index was ever finished, but presumably there's at least a partial draft out there somewhere. [1]: https://docs.google.com/leaf?id=0B_pEp00B111JNjZjZjE1NGUtN2YwOC00OTUyLWE4NmYtNzEzY2VhMzk5Y2Iz&hl=en [2]: http://books.google.com/books?id=KX6D6hefyA0C&lpg=PP1&dq=%2522index%2520to%2520mathematical%2520problems&lr&pg=PP1#v=onepage&q&f=false [3]: http://books.google.com/books?id=n-F52zK2UAgC&lpg=PR7&ots=cwyXL3xTg4&dq=%2522mathematical%2520monthly%2522%2520problems%2520solutions%2520index&lr&pg=PP1#v=onepage&q&f=false [4]: http://books.google.com/books?id=RJVii6vc0NAC&lpg=PP11&ots=C4dnFu344h&dq=Stanley%2520Rabinowitz%25201985-1989&pg=PP11#v=onepage&q=Stanley%2520Rabinowitz%25201985-1989&f=false