As far as finding information without being able to visit the main archives:
1. the Official Records are on a couple of sites (
https://ehistory.osu.edu/books/official-records is one place)
2. there are many, many newspaper sites (
http://chroniclingamerica.loc.gov/ is only one and is very good)
3. Fold3.com has a huge amount of National Archives material for a very reasonable fee if you are going to use them very often
4.
https://archive.org/ lets you look for books and documents and be shown which libraries hold them. Then go to the web site for the library and you will find may of the original documents on the library site
5. Google books is very useful, frequently find out of print post-war books
6. the National Archives is in the process of posting copies of the 2,500 ledgers (1259 available now) that they hold from the Confederacy. These are clothing issues from single companies, letters sent records from many armies and departments, etc. They don't seem to want people to find these ledgers, so I will post below the path to get to them:
1.
www.archives.gov/research/catalog
2. In the center search box, enter 596501 and Enter
3. Top center, click on the link "Record Books of Executive, Legislative and Judicial Offices of the Confederate Government"
4. Half way down, on the right side, click the blue box "Search Within This Series"
5. Top Left, in the light blue box, click "Archival Descriptions with Digital Objects"
You have arrived!! The documents are loaded in the order they were scanned and cannot be "Searched" in any convenient way. I suggest you go to Results per Page and set it to 100, then search each page with Control F and your item of interest. Remember to "search" each time you change pages (ie "Navy" will never find a hit unless you "search" on the page that has the Navy document on it.
If you have the Volume and Chapter numbers from a previous visit, these will search well.
None of these are on Fold3 and they have no intention to put them there.
If you want to Save a page of the final book, use the Save button in the center, under the image. This will save the entire page/pair of pages, not just a screen shot.
To save an entire ledger, on its home page, scroll down below the thumbnails and click on PDF. Then scroll up a little and look for the arrow pointing down, just under the tumbs. Click and wait. Many of the ledgers are 1+ gigs, so it take time, but it is much easier to work with the downloaded copy than to try to work downloading one pair of pages at a time.