Why Are Old Textbooks Often More Durable Than Newer Ones?

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Hornbein
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I got a copy through interlibrary loan. 1950 and it looks great. While the textbook I bought in 2012 for $60 has the pages all warped and turning yellow. They don't make 'em like they used to.

I can buy a used hardcover copy of the first edition for $21. I might go for that.

Some joker wants $200 for a used paperback copy in "acceptable" (the lowest rating) condition. Ha ha. Very funny.
 
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fresh_42 said:
But the pages were thinner in former times. At least in my books.

Thinner but denser. It feels like a brick.