Here's why:
* Many magazines changed their design: Magazine layouts are constantly evolving. It's very likely several magazines made changes to their front covers in 1998, and some of those changes could have involved removing the table of contents.
* No central database: There isn't a central database tracking every magazine cover change across the years.
To find out which magazine you're thinking of, you'd need to:
1. Remember more details: What type of magazine was it? What was the general theme? What other elements were on the cover?
2. Do some research: Look at old issues from 1998 of magazines that fit your description. Search online for articles or discussions about magazine design changes in 1998.
Let me know if you can provide more details, and I can try to help you narrow down the search.