[en] In order to obtain a better understanding of the X ¹Σ⁺ ground state and the A ¹Σ⁺ state potential energy curves of lithium hydride and to examine in detail the concept of ''mass-reduced quantum numbers'' for both an ordinary (X ¹Σ⁺) and an anomalous (A ¹Σ⁺) electronic state, the emission spectra of the A ¹Σ⁺ → X ¹Σ⁺ bands of the isotopic lithium hydrides and deuterides ere photographed in the 3000 to 5000A region with a 3.4 meter Ebert Spectrograph. The bands found involved v'' = 0 to 7 to various v' = 0 to 17 for ⁶LiH, and v'' = 0 to 7 to various v' = 1 to 16 for ⁶LiD. Additional bands involving v'' = 4 and 5 were also found for ⁷LiH. The vibrational-rotational spectroscopic analysis of ⁷LiH, ⁶LiH and ⁶LiD are reported here, as are the reanalyses of the ⁷LiH and ⁷LiD data reported by Crawford and Jorgensen. New Rydberg-Klein-Rees (RKR) A ¹Σ⁺ and X ¹Σ⁺ potential curves have been constructed for each individual molecule and are reported, but detailed isotopic comparisons will be reported in subsequent publications