boost_1_45_0/libs/graph/example/figs/telephone-network.dot

graph G {
  size="5,5.3"
  ratio="fill"
  edge[style="bold"]
  Nobel
  McKellar
  "Parry Sound"
  "Horseshoe Lake"
  Rosseau
  Mactier
  "Bent River"
  Dunchurch
  Magnetawan
  Kearny
  "Glen Orchard"
  Sprucedale
  Novar
  Huntsville
  Bracebridge

  Nobel -- McKellar[label="9", weight="9"]
  Nobel -- "Parry Sound"[label="3", weight="3"]
  McKellar -- Dunchurch[label="11", weight="11"]
  Dunchurch -- Magnetawan[label="12", weight="12"]
  McKellar -- Magnetawan[label="30", weight="30"]
  Magnetawan -- Kearny[label="20", weight="20"]
  Magnetawan -- Sprucedale[label="20", weight="20"]
  Kearny -- Sprucedale[label="13", weight="13"]
  Sprucedale -- Novar[label="18", weight="18"]
  Sprucedale -- Huntsville[label="15", weight="15"]
  Kearny -- Novar[label="8", weight="11"]
  Novar -- Huntsville[label="5", weight="5"]
  Huntsville -- Bracebridge[label="30", weight="30"]
  Huntsville -- "Bent River"[label="30", weight="30"] 
  Rosseau -- "Bent River"[label="8", weight="8"] 
  Rosseau -- "Horseshoe Lake"[label="8", weight="8"] 
  Mactier -- "Horseshoe Lake"[label="14", weight="14"] 
  "Parry Sound" -- "Horseshoe Lake"[label="10", weight="10"] 
  "Parry Sound" -- Dunchurch[label="20", weight="20"] 
  Mactier -- "Glen Orchard"[label="9", weight="9"] 
  "Glen Orchard" -- Bracebridge[label="15", weight="15"] 
}