Historical clue formulations

• River across the New York/New Jersey border — 2021-08-29
• New York/New Jersey's ___ Mountains — 2001-12-08
• New York/New Jersey's ___ Mountains — 2000-03-04
• New York and New Jersey river — 1996-04-07
• New Jersey's___Mountains — 1996-01-04
• New Jersey mountain range — 1994-03-06