He wrote the "Notebook" column in Harper's magazine regularly for many years, and one of the very admirable things about Harper's is that the entire history of the magazine is (for subscribers) available in PDF. Here's everything Lapham published there: https://harpers.org/author/lewishlapham/

And when I say entire history, I mean back to 1850 something. It's also indexed, subject tagged and searchable. If you search the archive for "Dickens" you'll see that several of his novels were published there originally in serial form, but you'll also find random non-fiction essays he published, as well as his contemporaries writing about him. It's kind of an extraordinary resource.