Another opinion
Im kind of reading between the lines here but I am getting a sense that you believe most or at least very many early cards were glued into scrapbooks. Except for a few issues where a book was specifically made for a series to be attached, I would guess at least 90% of pre WW 2 cards were never glued or pasted, maybe even more like 98%. Kind of depends on the series. Many of the E cards seem to have glue on the back but certainly not most. Just my opinion here.
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