Longest Running Manga by Volume Count (51-100)
Manga
No. 55 is Somubu Somuka Yamaguchi Roppeita by Norio Hayashi & Yamaguchi Roppeita, which started in 1986 and ended in 2016 with 81 volumes & 731 chapters in Big Comic
No. 64 is Marugoshi Deka by Ken Kitashiba & Michio Watanabe, which started in 1986 with 75 volumes & 395 in Weekly Manga Sunday Jiysugyo no Nihon Sha.
No. 82 is Jingi by Ayumi Tachihara, but it doesn't have the amount of volumes or release date it says in Young Champion Akita Shoten.
No. 83 is Direful Industrial Volleyboys is Hiroyuki Murada, which started in 1989 with 67 volumes & 711 chapters in Weekly Young Magazine Kodansha.
No. 64 is Marugoshi Deka by Ken Kitashiba & Michio Watanabe, which started in 1986 with 75 volumes & 395 in Weekly Manga Sunday Jiysugyo no Nihon Sha.
No. 82 is Jingi by Ayumi Tachihara, but it doesn't have the amount of volumes or release date it says in Young Champion Akita Shoten.
No. 83 is Direful Industrial Volleyboys is Hiroyuki Murada, which started in 1989 with 67 volumes & 711 chapters in Weekly Young Magazine Kodansha.
Tasogare Ryuuseigun
Like Shooting Stars in the Twilight

Manga, ? vol, 1995
Me:-
Author:-
71 volumes & 619 chapters
Hana no Keiji: Kumo no Kanata ni
The Magnificient Bastard: The Legend of Keiji

Manga, 18 vol, 1989
Me:-
Author:-
68 volumes & 381 chapters
Rakudai Ninja Rantarou
Rakudai Ninja Rantaro

Manga, 65 vol, 1986
Me:-
Author:-
65 volumes & 362 chapters
Pocket Monsters Special
Pokémon Adventures

Manga, ? vol, 1997
Me:-
Author:-
64 volumes & 616 chapters