1825 Matron Head Large Cent

1825 N-9

your pickup for this variety is the lump on the bottom of the T in CENT

sure thing.

google is pretty bad for the large cent varieties. the books are going to run a couple hundred dollars. william noyes does a nice 1793-1814 and also has an outstanding comprehensive 6 book set for the whole series. john wright did a great book on the 1816-1839 cents. bob grellmans one for the 40-57 coins is also great.

PCGS coinfacts (free phone app and solid webpage) has images for all the varieties. it can take a bit of time to brute force you way through some of the years, but the images exist.

the Dan Holmes auction catalog also has images of almost all the varieties and the catalogs from the 3 sales are available on the newman numismatic portal.

the American Numismatic Association is the national coin club. they have a fantastic library that members can borrow from. you pay postage and they will send you books. you could always join the club and borrow the books when you need them. this has the added bonus of also granting access to a ton of other books.

i have found the books to be worth many times their cost, but I also work with large cents for my job and handle a bunch of them every year. ymmv