Bolton's Patent Code For Transmitting Messages By The Electric Or Magnetic TelegraphFrancis John Bolton, Francis John Bolton (SirHäftad, 2023173 kr
Bolton's Patent Code For Transmitting Messages By The Electric Or Magnetic TelegraphFrancis John Bolton, Francis John Bolton (SirInbunden, 2023345 kr
Graphical Studies of Marriages of the DeafAlexander Graham Bell, Edward Allen FayInbunden, 2023402 kr
Researches in Telephony [microform]Alexander Graham Bell, American Academy Of Arts And SciencesHäftad, 2021168 kr
Education of Deaf ChildrenJoseph Claybaugh Gordon, Edward Miner Gallaudet, Alexander Graham BellHäftad, 2022298 kr