I have a set too, and I cannot recommend them highly enough.
I found five of the set at a second bookstore in Byron Bay, and two were secured courtesy of John, via some kind overseas contacts.
What I particularly like about them is that they contain the observing notes and drawings of (mainly) amateurs of many objects through different apertures. It is quite an education to see what others see and observe, and can inspire you to look more carefully at objects you might otherwise just venture a glance at.
Some of the introductory notes are a tad dated, but they still contain lots of gems of information worth learning.
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