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We’re wrapping up our study of Dewey Decimal call numbers with one more quick post. And I’ll admit…I’m a little sad that the project is almost over. It has been really fun to learn all about this wonderful cataloging system that is used by many libraries. The following list is going to be pretty short, since there aren’t too many call numbers in the 700s, 800s, and 900s that are currently unassigned.

Thanks for sharing the journey with me!

744 (Mathematical and Scientific Drawings; Mechanical Drawings)

This sounds like it would have been a really interesting classification. Previously, this section of the library’s collection would have housed books on a variety of topics, including drafting, the furniture and instruments needed, and even storage and preservation of your drafts, as well as best practices (and of course, blueprints!) I’m not sure where I would shelve these books now. But, if I had to guess, I would put them somewhere in 740 (drawing) or in 690 (building) depending on what the book was.

756 (Historical; Battles, etc.)

This classification used to house books on historical artwork, especially those focusing on battles. It sounds like an interesting classification, so I’m curious as to why it was removed. My best guess is that it was absorbed into 759 (Various Schools and Styles of Painting) and that the pieces were simply worked in with other pieces by their respective artists. Alternatively, they could be in 758.9, which covers “collections” of paintings, and could easily accommodate a volume that was just war paintings. Finally, historical portraits (such as General Washington) would be in 757 (Human Figure; Portrait).

762 (Intaglio Engraving; Metal Engraving)

Intaglio is a type of engraving process used for printmaking. The big difference between this and other methods of printmaking is that in Intaglio, the ink is caught in the grooved lines you carve, while in woodblock, for example, the ink is on the flat surfaces left behind, NOT the grooves. So, let’s pretend that in the image below, any part that is black is where the ink is. And in each image, the letters were carved out of a block. So, in the image on the left, “METAL” was carved out of a metal block, and the ink seeped in and was left behind when the stamp was wiped. This is what would show up on the paper when you used your metal stamp. In the right image, “WOOD” was carved out of the block, but the ink did not sink into the letters. Instead, it stuck to the flat surface that remained and was then left stamped onto the paper:

Regardless of what printmaking technique you use, books on the topic can now be found in the 760s, such as 760 (printmaking). Or, you could try 765 (metal engraving) for more.

768 (Machine Engraving)

Like the above listing, books on machine engraving (which covers topics like creating banknotes) can be found reclassed into 760 for printmaking.

775 (Photolithography)

Photolithography is a method of transferring images to film using UV light. If you’re interested in books on photolithography, you can find them mixed into 770 with the photography books.

804 (Essays, Letters, Addresses)

Classification 804 is no longer used, but once housed essays. I imagine that this is because collections of essays are now sorted under their respective countries of origin. If you have a collection that features the work of many authors from different countries, I would assume that could be found in 800, or it could have been grouped with a completely different classification, depending on the topic. So, for example, a collection of medical essays might be found in 610, while a collection of essays on a political topic would be in 320.

991 (Malasysia and Indonesia)

According to LibraryThing, Malaysia is now shelved under 959.5 and Indonesia at 959.8. This would move both countries from “Oceania and Elsewhere” to “Southeast Asia”.

992 (Sunda)

DDC Edition 14 describes Sunda as covering Sumatra and Java. And a quick Google search states that the Sunda Islands contain Burnei, East Timor, Indonesia, Singapore, and Malaysia. While I couldn’t find a ton of information, it looks like these books would also be included in 959, as with the classification above.


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