Volume 1 of this book can be read at archive.org: https://archive.org/details/bellsystem_HistoryOfEngineeringAndScienceVol1 https://archive.org/details/bellsys

Volume 1 of this book can be read at archive.org: https://archive.org/details/bellsystem_HistoryOfEngineeringAndScienceVol1 https://archive.org/details/bellsystem_HistoryOfEngineeringA... Another interesting book is "Engineering and operations in the Bell System", which can be borrowed at archive.org: https://archive.org/details/engineeringopera0000attb https://archive.org/details/engineeringopera0000attb