Found the following hamletworks.org entries referring to line 31
View Material Textual Note for 29
29
Bar. Welcome Horatio, welcome good Marcellus,
1.1.20
View Commentary Note for 31
31
Bar. I haue seene nothing.
1.1.22
View Material Textual Note for 31
31
Bar. I haue seene nothing.
1.1.22