The Spelling Progress Bulletins (SPB) were published in US, by Newell W. Tune, between 1961 and 1983, with quarterly issues. Society members contributed many articles, including the proceedings of the first conferences, held in UK.
The Spelling Reform Anthology (1981) included the best Bulletin articles, set out in 21 themes. This is in Books.
Spelling Progress Quarterly (SPQ) followed the Bulletins after Newell Tune died. We only have 7 issues. The image files are hard to read but show the presentation of the original print copies.