Cover claims to be all new contents, but all of the material originated from Blondie Comics Monthly (Harvey, 1950 Series), Chic Young's Dagwood Comics (Harvey, 1950 Series), and/or Daisy & Her Pups (Harvey, 1951 Series).
Primary data from Michael Tiefenbacher. Further details needed.
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It's basically three comics rebound into one - one issue each of Blondie (#52), Dagwood (#28) and Daisy (#11), with the last two including the original Statements of Ownership.
The original ads are omitted, and some assorted one-page strips are added at the beginning and in-between the original issues to take their place to fill out the 96 pages.
The 'All-new stories' blurb refers to the original comics.
This issue has variants: