41. It is now a forest preserve meadow. 42. The Lassen area was first protected by being designated as the Lassen Peak Forest Preserve . 43. He would subsequently establish several forest preserves . 44. CFC specializes in Lake County Forest Preserve District and Forest Preserve District of Cook County. 45. CFC specializes in Lake County Forest Preserve District and Forest Preserve District of Cook County. 46. The Constitution specifically allows reservoirs in the forest preserve , but makes no mention of wells. 47. Damaged trees were found this week in a forest preserve near O'Hare International Airport. 48. The Forest Preserve District of DuPage County owns and manages of prairies, woodlands and wetlands. 49. The refuge was established to provide a nature and forest preserve for aesthetic and conservation purposes. 50. The refuge was established to provide a nature and forest preserve for esthetic and conservation purposes.