How well is a particular textbook selling?

Post date: 2019-11-18 14:25:02

How can I find out how many copies of a specific textbook have been sold? What is its adoption rate? Or what rank, or share of the market, does a particular book occupy?

I'm looking to compare sales of a number of different science textbooks, specifically in the higher education (i.e. college & university) market, at either the US/North American or global level (not at the state level or within individual schools).

Presumably individual publishers keep their own detailed sales figures fairly secret. But are there any publicly accessible numbers? Are there any associations or services that track and report this information? I'd be willing to pay a small amount to access this kind of info, but I'm just me, not a corporation that can afford to fork over thousands of dollars.

Just to be clear, I'm not looking for larger market trends (ex. ebook sales vs. printed books) or overall annual sales for publishers, but rather the ability to look up sales data for specific titles.

My weak google-fu has failed me so far...

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