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Ok , just FYI - the light blue copy I was thinking of is the first 1973 edition , and the green edition is the second edition from 1979. Got my blue edition with a mirror grinding kit purchased 1974.
I would like to make comparison but my blue edition has been lent out some time in the past, only now have the green .
Just a tidbit : This was republished just before the sale of Amateur Astronomers Supply Co and the rebadging of the business as Astro Optical Supplies for sale as my March 1979 receipt for a C8 shows the AOS letterhead .
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