That one shows up in the Works Database over on the left side of this page. According to the database, that poem only shows up in that magazine, so that's a nice thing (although mjp will tell you that he has run into problems with poems that were re-named either slightly or considerably; doing a cross-reference on those occurrences is prohibitively difficult). So, the database isn't 100% accurate, but it is a damn fine tool.
Anyway, the magazines like that, especially as far back as 1961, tend to be somewhat rare, but I don't know if that particular magazine is especially rare or valuble. Typical magazines with a poem or three sell for about $20 in VG-fine condition. There are a couple of folks here who will know just about everything there is to know about this one; so sit tight. They'll stop by.