This was an article from 1999 S&T I found on
" PLANETARY NEBULA OBSERVATIONS
FROM FERGUSON'S LIST"
Copyright (c) 1996-2013, Stephen R. Waldee - All Rights Reserved
Sharpless 2-235 was referenced briefly by Steve Gottlieb, deep-sky maven par excellence who has observed more than 7,000 of the NGC and IC objects, in his very interesting and useful 1999 post to the Astronomy Connection forum mailing list called "Observing with the H-Beta filter" -- now apparently off the regular website, but found by me in a Wayback Machine archive link -- ""
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