Found the following hamletworks.org entries referring to line 3469

View Commentary Note for 3469
3469 King. O he is mad Laertes.5.1.272

View Immaterial Textual Note for 3469
3469 King. O he is mad Laertes.5.1.272

View Material Textual Note for 3469
3469 King. O he is mad Laertes.5.1.272