Rangers at the Logan Pass Visitor Center (9 a.m.–7 p.m. late June–Labor Day, 9:30 a.m.–4:30 p.m. Labor Day–Sept. 30) keep the fireplace stoked on chilly days and dispense maps, backcountry permits, and advice.
More-detailed maps and books on the park’s trails, geology, and history are available from the Glacier Natural History Association here.
The St. Mary Visitor Center (7 a.m.–9 p.m. late May–Labor Day, shorter hours in spring and fall) is located just inside the eastern park entrance.
Free park shuttles (every 30 minutes, 7:15 a.m.–8:15 p.m.) leave from the St. Mary Visitor Center to Logan Pass [1]. Glacier Park Inc. (406/892-2525, www.glacierparkinc.com [2], several buses daily early June–late Sept., $8 to Many Glacier [3], no reservations) also runs shuttle buses on the east side of the park, providing transportation to East Glacier [4], Two Medicine [5], Cut Bank, Many Glacier [3], and Waterton [6].
Links:
[1] http://www.moon.com/destinations/montana/glacier-national-park/logan-pass-st-mary/sights/logan-pass
[2] http://www.glacierparkinc.com
[3] http://www.moon.com/destinations/montana/glacier-national-park/many-glacier
[4] http://www.moon.com/destinations/montana/glacier-national-park/east-glacier-and-vicinity
[5] http://www.moon.com/destinations/montana/glacier-national-park/east-glacier-and-vicinity/two-medicine
[6] http://www.moon.com/destinations/montana/glacier-national-park/waterton-lakes-national-park