Anonymous wrote:Ranger in Time especially if he likes dogs (about a time traveling dog)
Baseball card series (eg Babe and Me) about a kid with magic baseball cards that allow him to travel back in time to meet baseball’s greats (fair amount of social history too, including baseball stars from the Negro Leagues, etc.)
Mary pope Osborne odyssey series.
Yes! This series is great!! DC tore through them all.
https://www.amazon.com/s/ref=nb_sb_ss_c_1_24?url=search-alias%3Daps&field-keywords=baseball+card+adventures+series+by+dan+gutman&rh=i%3Aaps%2Ck%3Abaseball+card+adventures+series+by+dan+gutman
From there, we found the author's Genius Files series. Five books -- totally different than the baseball series but every bit as good.
https://www.amazon.com/Genius-Files-Mission-Unstoppable/dp/0061827665/ref=sr_1_1?s=books&ie=UTF8&qid=1533046693&sr=1-1&keywords=mission+unstoppable&dpID=61HgnG6bnJL&preST=_SY291_BO1,204,203,200_QL40_&dpSrc=srch