Travel document number?

I’m currently filling out the I-130 form for my husband. It’s asking for his travel document number and this is asked separately from his passport number. He has a B1/b2 visa but I am not sure which number is the travel document number. I’ve tried looking online and it says a red number in the bottom right corner but there is no such number on his Visa card. Does anyone know which number this refers to? Thanks!

submitted by /u/AstroWolf11
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