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Describing the question in the title further,

The section, Systems Toxicologic Pathology, Dianne M. Creasy, Robert E. Chapin, in Haschek and Rousseaux's Handbook of Toxicologic Pathology (Third Edition), 2013), mentions that

There are three classes of spermatogonia: stem cell spermatogonia, proliferative spermatogonia, and differentiating spermatogonia.

In common literature, there are following three subtypes, namely mentioned in the below Wikipedia article:

There are three subtypes of spermatogonia in humans:

Type A (dark) cells, with dark nuclei. These cells are reserve spermatogonial stem cells which do not >usually undergo active mitosis.
Type A (pale) cells, with pale nuclei. These are the spermatogonial stem cells that undergo active mitosis. These cells divide to produce Type B cells.
Type B cells, which undergo growth and become primary spermatocytes.

Source: Wikipedia - Spermatogonium
Also mentioned in Wikipedia - Spermatogenesis : Stages subsection (refer first row of the table)

I am unable to find anything relevant about the "classes" anywhere else (and I do not have full access to the mentioned textbook). Although I don't have full access to this book, here is the preview to the subsection in the text in ScienceDirect.
(You may find in page to locate the above line)

Additional Note : AL is a newly discovered subtype of spermatogonium. So it's Ad, Ab, B and AL now.

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