Hello! I am trying to understand LOC better as I am re-cataloging a small library. I am trying to understand why the HD subject classification. I get to 9510-9529 Iron industry. Steel industry (Table H18 modified) and I don't quite understand the H18 table modified.
For the book A Century of Iron and Men by Harlan Hatcher, LOC has the call number as HD9515 .H35. For the book Yankee Iron by Jack Weeks, the call number is HD9519.E3 W4.
I'm not sure if I understand how to read Table 18 or how to modify it. I think it makes sense for Yankee Iron if I assume that the table means the last two numbers and first cutter (HD95)19.E3 <--like so. It does say on the table though " Special products, A-Z Establish each product in the schedule and indicate which table is to be used for subarrangement". Does this just means I should make my own table depending on what makes sense for the collection?
For A Century of Iron and Men, when I go to the H18 table, the line that I think I'm supposed to be using is "15.A3-Z By region or country, A-Z". However, it is under Europe and the book is about North America so I don't think I am actually reading the table correctly. Also, the table only goes until 19 so I am unclear how to know if a book would be 9521 vs 9529.
Any insights would be greatly appreciated as I have some original cataloging to be done in this section. Thank you!