"More than a finely etched, honest portrait of an artist, Margaret Wise Brown: Awakened by the Moon is an exciting, fast-paced glimpse into the very beginnings of the golden age of children's book publishing in America. Leonard Marcus has cut through the smog of indifference and condescension that has bedeviled the lives and careers of everyone seriously involved in producing art for children, and has restored Brown to her rightful place as both pioneer and poet."
That's the blurb on the back of the hardback edition (Beacon Press, 1992) of Leonard Marcus's biography of Brown, which I'm currently reading. By the time the HarperCollins Perennial paperback came out in 1999, the last sentence in Sendak's quotation had been shortened to "Leonard Marcus has restored Brown to her rightful place as both pioneer and poet," with no mention of smog, indifference, or condescension, etc. The difference is interesting, isn't it?