Which genres do you like? And do you want on-going or completed series?
If you like shounen adventure, then you will probably like 666 Satan
(Also known as O-Parts Hunter
). It has 76 chapters - but 19 volumes, so I'm guessing it might be too long. Saiyuki
is a great shounen adventure manga as well, with more shoujo-ish art (and bishounens!). It has 55 chapters collected in 9 volumes.
If you like slice of life comedy, then you should enjoy Azumanga Daioh
. It has 60 very short chapters collected in 4 volumes.
If you like one-shots, then I got a few you might like:Hotarubi no Mori E
- By the mangaka of Natsume Yuujinchou. It's one volume containing 4 one-shots. All the one-shots are shoujo romance/drama, very cute without being too fluffy. Hotel
is probably one of the best one-shots ever. In just one chapter, it tells the story of our world, after humanity has self-destructed.
All these series are completed and can be found scanlated. Be more specific if you want more recommendations