What has the author William Heacock written?

William Heacock has written:

'Fenton Art Glass Co. Price Guide'

'One-Thousand (1000) Toothpick Holders'

'Fenton Glass the Third 25 Years with 1998 Price Guide'

'Harry Northwood--the Wheeling years, 1901-1925' -- subject(s): Criticism and interpretation, Glassware, History, Northwood Glass Company