к концу 19-го века
• Towards the end of the 19th century the use of ... was generally accepted as ... By the turn of the 19th century ...
Русско-английский научно-технический словарь• Towards the end of the 19th century the use of ... was generally accepted as ... By the turn of the 19th century ...
Русско-английский научно-технический словарь