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The scroll that's below is the last scroll you read, making it the last volume.
The 下 uses the alternative reading of げ but 巻 is all good and normal.
この経済学の教科書は上巻と下巻があるんだよ。
This economics textbook has the first volume and the last volume.
上巻を買ったつもりが下巻を買ってしまっていた。
I thought I bought the first volume, but it was actually the last volume.
下巻では、主に田舎の景色について語られています。
In the final volume, rural scenery is the main topic.
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