Give your players this hands on Spell Book for their Spell-casting characters. Compiled from the existing spell descriptions in the classic-style fantasy RPG Swords & Wizardry Core Rules by Matt Finch.
But why stop with wizards? You don’t want your players casting spells of divine intervention to be left out? This book of divine spells are for Cleric or Druid characters. Also compiled from the existing spell descriptions in the fantasy RPG Swords & Wizardry Core Rules and Supplemental Lore by Skathros.
With a few modifications both of these books can be used with most old style fantasy RPGs.