E90-1 Scarcity
Without going into too much minutiea, the scratch patterns on the back of E90-1s indicate a larger sheet than 30 cards (much as I appreciated Ted Z's great wisdom).
The scratches indicate that cards were swapped out in different positions over time. The significant scarcities, like Stahl and Shean, Young Cleveland and Duffy, and Wagner Throwing and Speaker, were most likely part of the last printed sheet layout and therefore effectively "short printed." Moreover, some cards - like Demmitt and Mathewson - may have appeared in several locations on the early sheets making them somewhat more common.
I believe there were at least 3 and likely 4 different sheet layouts used over time, based on the fact that for some scratch patterns, you can find 4 different cards with the identical back.
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