The November 2005 Kickshaws reported the discovery of Dave Moore of a 61-letter pangrammatic window (contiguous string of letters in a published text that contains every letter of the alphabet at least once) in Bret Harte's Flip: A California Romance. Although reported as a new record, that discovery just ties the 61-letter example found in 2004 by Dan Tilque in The Detroit News and mentioned in Word Ways at the time - though it is nearly undeniable that the Bret Harte example is of higher quality, as the Detroit News window contains proper names as well as two numerals, whereas the Harte example has no proper nouns or extraneous characters.
"Sub-60-Letter Pangrammatic Windows,"
Word Ways: Vol. 39
, Article 2.
Available at: https://digitalcommons.butler.edu/wordways/vol39/iss1/2