Writing with fountain pens in notebooks present problems of its own, as most of the are not really designed for this. Bleeding through and feathering are often problems. I am not the only one who has experienced serious problem with the "famous" Moleskine Brand that starts at around $15.00 on Amazon. Luckily there are alternatives that are a lot cheaper. I am thinking especially of the Black n'Red Din-A 5 notebooks (Black n' Red Casebound Notebook, Ruled, 8 1/4 x 5 7/8 Inches, White, 96 Sheets per Pad (E66857)). They are sturdily bound and even the wettest fountain pen does not leak or feather. The reason is not that the paper is better than the one you encounter in a Moleskine or other brands, but rather that it is coated. It is similar to the kind of paper used in German exercise books that I first encountered in the German exercise books during the fifties. It is perhaps also slightly thicker. You cannot even see the outlines of the writing on the other side of the page (as you can, for instance in Mead notebooks which also are made of paper coated in some way).
In any case, they are very serviceable and sell for $4.88 as an add-on item on Amazon. I highly recommend them.
Mind you, they have one disadvantage when used with fountain pens. The ink takes longer to dry than on uncoated paper. For this reason, I would recommend Löschpapier (blotting paper) as a place holder. This is not easily available in the U.S.A., but it is included in almost every cheap exercise book in Germany (because pupils actually still have to use fountain pens). One sheet will last for a very long time. If you do not have blotting paper, you just have to wait for a second or two before turning the page (which may be good for thinking).
I have no idea why the second-to-last page contains maps for the New York, Washington, and Chicago subway systems. I glue an envelope there to use for loos papers.