What does H & W stand for?

Harrison and Wollaston's English King's Bench Reports [A publication] (DLA)

Hazzard and Warburton's Prince Edward Island Reports [A publication] (DLA)

Holm & Wonsild [Steamship] (MHDB)

Hurlstone and Walmsley's English Exchequer Reports [1840-41] [A publication] (DLA)

Hardware (NAKS)

Hardware (ACAE)

Heavy Weathering

Highway

Harland and Wolff Ltd. (SAUO)

Hazzard and Warburtons Prince Edward Island Reports [A publication] (SAUS)

Health & Welfare (SAUO)

Hectowatt (SAUS)