You might be interested in the following SABR publications on Asian baseball
Nichibei Yakyu: US Tours of Japan, 1907-1958 (Volume 1)
Edited by Robert K. Fitts, Bill Nowlin, and James Forr
Associate editors: Len Levin and Carl Riechers
Foreword by Allan H. “Bud” Selig
Get it now from SABR
Nichibei Yakyu: US Tours of Japan, 1960-2019 (Volume 2)
Edited by Robert K. Fitts, Bill Nowlin, and James Forr
Associate editors: Len Levin and Carl Riechers
SABR Asian Baseball Research Committee Blog 