They are all Swamp Sparrows. A hatch-year (HY) White-throated Sparrow, which you could see in its first fall/winter would have white wing bars and would also have the white throat, yellow lores, and black/white head stripes of an adult (After hatch year [AHY]), just paler than an adult. You can check out the link below...it may be helpful. BN Here is a link that might be useful: plumages of WTSP

Well shoot. Lincoln's is one I should know. OK, I see it, I think. These sparrows drive me crazy, I was sure this was one I didn't know but now you say Lincoln's, i can see it. Thank you.

Yes, guides with arrows pointing to field marks aren't the ultimate in identification. Guides with notes about other birds with similar characteristics and then explanations about what to look for the tell the two apart are helpful. I have found that in most cases where IDs are difficult it's really beneficial to research more than one resource. We really have some tools now that weren't commonly available even fifteen years ago and that's access to the internet and cheaper digital cameras. I keep a digital right by the regular birding window. I take rapid frames of the birds in question from as many angles as I can. Sometimes you don't have time to focus and be fussy. Getting a less than perfect picture is not always a failure. If it helps you to catch the target sitting next to a known bird, immediately you have a handle on size. I also prefer real photographs I find on this forum, because painted representations just leave too much to artistic license. LOL. I sometimes wonder how many really cool sparrows I missed by logging them as something common? So many folks just causally dismiss them because they look similar. This is where you sometimes find your lifers! Keep a notepad handy to your observation station to mark down anything you notice on field marks. I have a good memory but the image in the brain can play tricks on you quickly. Draw a pic if you must, and try to catch some photos. Document, document and document.

This bird is a first-year (immature) White-crowned Sparrow (WCSP). White-crowned Sparrows retain their juvenile plumage throughout their first winter and into next spring when they molt into adult breeding plumage. Thus, in winter, you often seen immatures with brown head streaks (note the two dark brown streaks on the head correspond to the two black streaks of a mature bird) mixed with adult birds. Also, this birds beak is much to yellow-orange for a Field Sparrow, whose beak would be pinker. See link below of a great pic of an immature WCSP that was misidentified as a Field Sparrow. BN Here is a link that might be useful: WCSP, not FESP