50. The accuracy with which some of these wave lengths are determined is truly astounding; a ten-billionth of an inch!
"A Text-Book of Astronomy"
George C. Comstock
But then Pringle had not gone away, and the tale, that billionth-told tale, had still to be told.
"Caught in a Trap"
John C. Hutcheson
He wished Yerdeth were here; he'd show that fool what good his ten-to-the-billionth odds were.
"The Asses of Balaam"
Gordon Randall Garrett