(looking south from north-east)
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The arrowed building is NOT the actual site. See below.
(looking south from north-east)
To Hyakumanben
From Keihan Demachi-yanagi Station: about 10 min by walking (see the map above).
From JR Kyoto Station: City Bus 206 (eastbound)/17 (30-45 min), Hoop bus (~30 min)
From Subway Imadegawa Station: City Bus 201/203 eastbound (10 min)
(adapted from an old campus map by Kyoto University)
(1) 
(2) 
Find the 8-story building of Graduate School of Letters.
(3a) To Lecture room 1-3, turn right before the entrance of the main building. You will see these rooms on your left.
(3b) To Lecture rooms 4-7, enter the building (2) and go up to level 2. To psychology offices, enter the building (2) and go up to level 3.
This door is closed on holidays. Go round to the right, and there is another door that can be unlocked by typing the key.
If you take a taxi, the "main gate" or "the clock tower (tokeidai)" might be easier for the driver.
After passing through the gate, follow the main path to the left, pass by the main library, and come to the crossing (2) as shown above (a telephone box shown in the picture is the landmark).