- Cactus and Succulent Society of Australia
- 16-71
- Calaby, John
- 2-27 2-28
- California
- 9-27 16-90 17-21 17-71 23-29 23-30 23-31 23-32 23-33 25-102 25-105
- Canada
- 23-28
- Canberra
- 2-28 2-62 16-113 16-122 23-95 23-237 23-333 23-467 23-468 23-538 23-606 23-628 23-668 23-701 23-702 23-764 23-771 25-28 25-29 25-41 26-50 26-51 26-52 28-5
- Canterbury
- 16-93 23-149 23-287 23-395 25-88
- Canterbury Botanical Society
- 16-93
- Cape York
- 23-761 23-762 25-74
- Carter, C.
- 2-28
- Casey/Deakin Branch Wilderness Society
- 2-73
- Castlemaine
- 23-294 23-567 25-17
- Catcheside, David
- 2-32 2-60 17-40
- Catchments
- 16-125 26-3
- Celarier, Robert
- 2-27
- Central Australia
- 7-5 7-16 11-5 11-18 14-4 16-110 16-119 16-120 16-121 16-129 16-152 17-19 20-8 21-5 21-17 21-26 21-29 21-31 23-112 23-114 23-115 23-116 23-127 23-128 23-129 23-130 23-131 23-132 23-311 23-313 23-314 23-315 23-316 23-317 23-318 23-319 23-427 23-428 23-429 23-430 23-431 23-432 23-456 23-457 23-458 23-459 23-460 25-6 25-55 25-76 26-84
- Chambers, Carrock
- 2-19
- Chapman, J.R.
- 2-2
- Cheal, David
- 2-42
- Cheshire
- 23-275 23-416 25-85
- China
- 16-41 16-91 16-103 18-42 20-9 23-336 23-579 23-580 23-581 23-582 23-583 23-584 23-585 23-586 23-592 25-102 25-104
- Chinnock, R.J.
- 2-73
- Chippendale, George
- 2-59 2-74 16-120
- Chisholm, A.H.
- 2-21 4-12
- Churchill, David
- 4-10 10-1 20-6
- Clayton, W.D.
- 2-70
- Clifford, Trevor
- 2-33
- Climate
- 16-135
- Cockatoo
- 13-11 13-12 23-513 23-670 23-698
- Cocopara Nature Reserve
- 12-10
- Cohn, Helen
- 2-75
- Como Garden
- 26-9
- Como House
- 17-35
- Conifer Society of Australia
- 16-53
- Conifers
- 16-53 17-30 25-63
- Conley, David
- 2-73 2-74
- Conservation Council of Victoria
- 2-74
- Cooke, David
- 2-20
- Copeland, Edwin Bingham
- 2-27
- Coranderrk Reserve
- 12-9 23-238 23-295
- Corangamite Study Area
- 19-1
- Cornwall
- 2-75 16-104 17-12 23-5 23-7 23-8 23-17 23-18 23-246 23-247 23-248 23-279 23-280 23-281 23-412 23-413 23-414 23-558 23-559 25-86 25-95
- Cornwell, Norman
- 2-74
- Costermans, Leon
- 2-64 3-17 3-19
- Costin, Alec B.
- 2-23
- Council of Adult Education (CAE)
- 5-8 14-6
- Court, Arthur
- 2-12 2-34
- Court, Kathleen
- 2-34
- Cradle Mountain
- 16-59 17-10 17-29 23-135 23-136 23-364 23-365 23-751 23-752 25-56 25-57
- Cranbourne
- 10-1 18-9 23-223 23-230 23-670 25-62
- Crawford, Isobel
- 2-73
- Creswick
- 2-56 2-57 9-16 11-8 13-7 13-18 16-15 16-53 16-154 17-54 17-69 17-74 18-34 20-8 23-41 23-42 23-43 23-50 23-64 23-71 23-74 23-94 23-97 23-98 23-109 23-111 23-118 23-125 23-140 23-142 23-143 23-147 23-156 23-169 23-170 23-178 23-195 23-196 23-199 23-217 23-221 23-222 23-224 23-225 23-232 23-240 23-292 23-296 23-368 23-369 23-383 23-419 23-420 23-421 23-422 23-423 23-449 23-465 23-468 23-469 23-482 23-484 23-486 23-490 23-509 23-519 23-561 23-578 23-593 23-595 23-621 23-641 23-659 23-692 23-700 23-747 23-765 23-770 25-14 26-7 26-19 26-20 26-21 29-6
- Crichton, George
- 2-74
- Croll, Robert
- 2-73 2-74 2-75
- Crown Land
- 2-56 3-19 18-3
- Cuffley, Peter
- 2-73
- Cunningham, G.H.
- 2-27 2-51
- Curtis, Winifred
- 2-29 2-34
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