Abby Werlock's biographical sketch at this site provides some good answers to this question.

See "The Ending of The House of Mirth: What was the Word?" for some possible answers. 

Many libraries will have access to FirstSearch, which includes the MLA Bibliography, and they will also have one or more of the following full-text databases. You can go to your local university library's home page and see which of these resources are available to you. However, these resources are generally available by subscription; they are free only on-campus or to registered students and faculty. 

Frankly, since northernlight.com took its offerings off-line and changed to a fee-based service, there is very little available for individuals; the best is FindArticles , which offers some full-text articles.  Those available on Wharton are linked to on the Current Bibliography page.

Amazon.com has also recently begun offering some scholarly articles online for a fee (usually $5.95).

If you anticipate being away from a library for a longer period of time and can afford it, you might try Questia.com. Questia.com has a lot of scholarly books and some articles as well as a number of Wharton's works that are not otherwise available online, such as The Buccaneers. The site costs about $20 per month for one month.
 

You might also want to look at Sarah Bird Wright's Edith Wharton: A to Z. This is an encyclopedia-style book about Wharton with short essays on topics related to Wharton and her works.  Each essay has a brief bibliography, too.  Looking at the essays here would help you to see what you'd be most interested in pursuing.
 

Until they are, you have other options:
1. Order the article through your local library's Interlibrary Loan program.
2. Order the back issue of the journal by using the mail-in form.
 

 "You have hit upon the exact word; I was fond of him, yes, just as I was fond of my grandmother, and the house that I was born in, and my old nurse.  Oh, I was fond of him, and we were counted a very happy couple.  But I have sometimes thought that a woman's  nature is like a great house full of rooms: there is the hall, through  which everyone passes in going in and out; the drawing- room,  where one receives formal visits; the sitting-room, where the  members of the family come and go as they list; but beyond that, far beyond, are other rooms, the handles of whose doors perhaps are never turned; no one knows the way to them, no one  knows whither they lead; and in the innermost room, the holy of  holies, the soul sits alone and waits for a footstep that never comes." 

  "And your husband," asked the Spirit, after a pause, "never got beyond the family sitting-room?" 

"Never," she returned, impatiently; "and the worst of it was that he was quite content to remain there.  He thought it perfectly beautiful, and sometimes, when he was admiring its  commonplace furniture, insignificant as the chairs and tables of a  hotel parlor, I felt like crying out to him: 'Fool, will you never  guess that close at hand are rooms full of treasures and wonders,  such as the eye of man hath not seen, rooms that no step has  crossed, but that might be yours to live in, could you but find the  handle of the door?'" 

Western Massachusetts.
The Mount. One of the most famous of Wharton's homes is The Mount near Lenox, Massachusetts.  It is still standing and is on the National Register of Historic Places.  Pictures and directions are available from the website at http://www.edithwharton.org.Directions for getting to The Mount are available at http://www.edithwharton.org/contact.html
You can also read about The Mount at The Mount: Edith Wharton and the American Renaissance. 

Boston. Although Wharton did not live in Boston, Edward (Teddy) Wharton was born there, and the couple stayed with his mother at her house at 127 Beacon Street (Lewis 71) on several occasions. When their marriage began to dissolve, Teddy Wharton rented an apartment in Boston. 

New York City
One of our members from NYC has said that the New York Public Library has some good information about EW sites in the city. Thanks to Jim Naureckas of New York Songlines for the following information about the buildings today: 

Rhinebeck, New York
Up the Hudson River from New York is Rhinebeck; The Age of Innocence and The House of Mirth have a lot of descriptions of houses in that area, including the Vanderbilt mansion near Hyde Park.Two late novels, Hudson River Bracketed and The Gods Arrive, also deal extensively with Hudson River architecture.

Wyndcliffe. Edith Wharton's aunt, Elizabeth Schermerhorn Jones, built a 24-room house called Wyndcliffe in Rhinebeck in 1852. Legend has it that this is the source of the phrase "keeping up with the Joneses." 

Many of the Gilded Age houses of Newport are open for tours, including The Breakers. Pictures of several of these are available on the Newport Mansions site at http://www.newportmansions.org.

France
Paris. In Paris, Edith Wharton  lived at 58, rue de Varenne and later 53, rue de Varenne before purchasing homes at Pavillon Colombe in Paris (in St.-Brice-sous-Foret).
Riviera. In 1919, Wharton purchased a chateau in Hyeres on the Riviera (Ste. Claire du Vieux Chateau).

Good sources of information, besides the biographies by Shari Benstock, R.W. B. Lewis, and Eleanor Dwight, include Theresa Craig's Edith Wharton: A House Full of Rooms and Sarah Bird Wright's Edith Wharton from A to Z.