Section 389.840 - Definitions As used in NRS 389.840 to 389.880, inclusive, unless the context requires otherwise:
1. "Basic textbook" or "textbook" means any medium or manual of instruction, including, without limitation, software for computers, containing a presentation of the principles of a subject and used as a basis of instruction.2. "Supplemental textbook" means any medium or material, including, without limitation, software for computers, used to reinforce or extend a basic program of instruction.3. A basic or supplemental textbook becomes "unserviceable" when 4 years have elapsed since its removal from the adopted list.(Added to NRS by 1967, 168; A 1981, 413; 1999, 3388)-(Substituted in revision for NRS 390.005) (Added to NRS by 1967, 168; A 1981, 413; 1999, 3388) - (Substituted in revision for NRS 390.005 )