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Scott ForrestBarry, you make a good point. It's genearlly recognized that ad backs for many different brands were printed at each print shop (possibly only one), so if the Plank and Wagner were pulled after production started, why don't we see them represented with a larger variety of 150-series ad backs?
Two scenarios I can think of: 1) they were on scrap sheets (as mentioned previously) that were only printed and/or survived for Sweet Cap and Piedmont or... 2) We know from the surviving ledger ad back examples that different backed cards were released in different regions at different times, even within a series, so possibley Sweet Cap and Piedmont were simply the first ad backs released and production runs of Magie/Wagner/Plank were stopped quickly, before other brands started being produced.
Nothing mind-boggling here, but some readers might not be aware of all this. Plus, if we provide enough of our own ideas, maybe someone who doesn't have tunnel-vision about this stuff will be able to put it all together. Email me for scans of ledger pages with ad backs.