Mangas with over 70 chapters

black cat
Akumetsu
Yamada-kun to 7-nin no Majo
black haze
Apocalypse no Toride (not over 70 but still long)

and Dengeki Daisy

http://www.mangago.me/read-manga/love_so_life/
http://www.mangago.me/read-manga/noblesse/
http://www.mangago.me/read-manga/the_gamer/
http://www.mangago.me/read-manga/crepuscule/
http://www.mangago.me/read-manga/tokyo_ghoul/
http://www.mangago.me/read-manga/wolf_guy_ookami_no_monshou/
http://www.mangago.me/read-manga/ao_no_exorcist/
http://www.mangago.me/read-manga/orange_marmalade/
http://www.mangago.me/read-manga/reimei_no_arcana/ <- not 70+ but its interesting.
http://www.mangago.me/read-manga/love_in_the_mask/
http://www.mangago.me/read-manga/shinobi_life/ <- not 70+ either
http://www.mangago.me/read-manga/karneval/

http://www.mangago.me/read-manga/tokyo_crazy_paradise/
http://www.mangago.me/read-manga/junjou_romantica/
http://www.mangago.me/read-manga/haru_wo_daite_ita/
http://www.mangago.me/read-manga/kanata_kara/ (14 volumes even though it`s referred to as 14 chapters)
http://www.mangago.me/read-manga/skip_beat/
http://www.mangago.me/read-manga/loveless/
http://www.mangago.me/read-manga/crazy_girl_shin_bia/
http://www.mangago.me/read-manga/koori_no_mamono_no_monogatari/
http://www.mangago.me/read-manga/silver_diamond/