The most widely circulated and respected versions of the Barron's GMAT guide peaked around the (roughly 2017–2020). The search term "Barron's 39" appears to be a persistent typo or a conflated memory, likely stemming from:

: Content on Arithmetic, Algebra, Reading Comprehension, Critical Reasoning, and Data Sufficiency remains highly relevant.

If you genuinely want a PDF (or ebook) of Barron’s GMAT book, here are the legitimate sources:

: Arithmetic, Algebra, Geometry, and Data Sufficiency.

in late 2023. While Barron's legacy material remains useful for core concepts, you should be aware of the following changes: Section Changes : The Focus Edition has removed the Analytical Writing Assessment (AWA) Sentence Correction sections, and it no longer includes New Section Data Insights