get list item versions in linq to sharepoint

You could try something like below, its not the actual code for your scenario, its just to get an idea for your requirement.

var posts = new List<Post>();
posts =
(from post in
contextSwitch.GetContext(webUrl).Posts
where post.PublicationLevel == 
SPFileLevel.Published
select post).Take(limit).ToList();

Where, PublicationLevel is as follows,

var item = (SPListItem)listItem;
PublicationLevel = item.Level;

Check the below source link for more details.

Source