He did it on like slips of actual paper index cards.

他在纸质索引卡上记载。

Othe than that I would strongly advise quite simple ideas like using a card index.

除此之外，我强烈建议一些简单的主意，像是使用卡片索引。

PLASTERED on the wall of San Francisco's main public library are 50,000 index cards, formerly entries in the library's catalogue.

以前记载着图书馆的书目条录的50000多张索引卡片，如今贴在了旧金山主要图书馆的墙上。