TITLE: Is there an index for solutions to American Mathematical Monthly problems?
QUESTION [31 upvotes]: There is a lot of good stuff contained in the Problems section of the American Mathematical Monthly.  One difficulty with extracting that information, however, is that if I see an old Monthly problem, it is not always so easy to locate the solution.  Sometimes the solution does not appear until many years later, and in some cases the solution has never appeared at all.  For those at an academic institution with access to JSTOR, sometimes an electronic search will turn up the solution, but if the search comes up empty, I am left wondering whether the solution was really never published or whether I just did something wrong with my search.  Furthermore, even with JSTOR access, there is no easy way to list (for example) all unsolved Monthly problems.
Does anybody have, or know of, an index of all the Monthly problems and solutions that would address this issue?  Failing that, is there any interest in creating such a publicly available resource?  If the work is divvied up among a few dozen volunteers it shouldn't take that much work.  As I envisage it, the index would (at least initially) not contain the mathematical content of the problems but would just give the bibliographic information for the problem and the solution (if any), and indicate which parts (if any) remain unsolved.

REPLY [9 votes]: In May 2017 I proposed an MAA pdf ebook series organized by subject.  My proposal included a sample covering the years 2000-2016, a subsample of which can be found here.
The proposal was received well, but it ultimately got rejected because nobody at the MAA knows whether it has the authority to reprint such a collection without obtaining new permissions from all the thousands of published proposers and solvers.  It probably does not help that Taylor & Francis now owns the journals too.
After receiving the rejection I sent each lead editor of the three problem columns a full version covering 2000-2016 (including the Putnam), organized by subject.  One of them replied: "Thank you very much for this incredible work!  This is very useful. 
Is this open to everybody out there?"
Sadly, no.
Earlier attempts include an ambitious database project spearheaded by Ivars Peterson during his tenure as Director of Publications (2009-2014). It eventually met with powerful resistance and died.
The MathPro Press collection (see Jonas's answer) was once available in a free searchable database.  Snapshots of the 1999-2005 and 2005-2010 versions are here and here, respectively.
I am currently putting together a free pdf of Index to Mathematical Problems 1975-1979 for my ResearchGate page.  Will put a link here when it's finished.  Stanley Rabinowitz is interested in doing the same for the 1980-1984 index.
============================ added 2018 Aug 16 ============================
Update:
The 1975-1979 index is now freely available as a pdf on my ResearchGate page and on my website, here:
http://www.mathematrucker.com/problems_1975-1979.pdf