This House of Sky

Harcourt Brace Jovanovich (New York) 1978 is the true first, and the census is confirmed. No contemporaneous British edition surfaced in the sources consulted, so no UK-vs-US precedence question arises and the US first is the sole collected first. One caution: HBJ records for the title show two closely related ISBNs (015190054X and 0151900558); the relationship between them is not resolved in the sources consulted and should not be presented as a binding or issue point until it is.