Printed
Published
noun
The item is in a place in its existence where it is published. If something is in this place, it is printed and published.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
その記事なら五月号所載ですよ。
If you are looking for that article, it is printed in the May issue.
確か『Tofugu』所載の記事で、助詞の「は」と「が」の違いが解説されていたはずです。
I believe there was an article published in Tofugu that explained the difference between the "wa" and "ga" particles.
『古事記』所載の日本最古の和歌について何か知っていますか？
Do you know anything about the Japanese first waka published in the Kojiki?