See 1-Across1AH. Royce who compiled the first comprehensive history of 51-Across, and may have had a deep voice?[----], 5-Across5ABrook in 51-Across named for an Englishman who was hanged nearby[-----], 42-Across42AMain business district of 51-Across before the arrival of the railroad[----------], 10-Down10D"Father of dental floss", born in 51-Across[------], and 58-Down58DHamlet in 51-Across[----]