[throw0101b]

> Well it's a thinly veiled ad...

Jason Kottke has been curating links on the inter-tubes for twenty-five years (1998). He simply links to stuff he thinks other will find cool: the fact that some of those items are purchasable does not mean the post is an ad.

* https://en.wikipedia.org/wiki/Jason_Kottke

His posts on the Apollo program go back to 2005:

* https://kottke.org/tag/Apollo/3

Here's another post on a book you can purchase by Edward Tufte:

* https://kottke.org/01/09/edward-tufte-author-of-three

* https://en.wikipedia.org/wiki/Edward_Tufte

Was that post an ad?

[archerx]

The intention of the post is to get people to buy photos/book (with a convenient amazon affiliate link) that should be free and in the public domain so yes, it is an ad.