240:
329:"}},"text\/plain":{"en":{"":"inception"}}},"{\"value\":{\"time\":\"+1917-06-01T00:00:00Z\",\"timezone\":0,\"before\":0,\"after\":0,\"precision\":10,\"calendarmodel\":\"http:\\\/\\\/www.wikidata.org\\\/entity\\\/Q1985727\"},\"type\":\"time\"}":{"text\/html":{"en":{"P571":"June 1917
252:
204:
81:
325:
409:
426:{{Information |Description={{en|1=Origional caption: "Fig. 36. Block system of Retreating Long-wall, West Virginia." Plan of a multi-panel longwall retreat mine, circa 1917. Edge detection has been used to convert the figure to a line drawing.}} |Sour
135:
Origional caption: "Fig. 36. Block system of
Retreating Long-wall, West Virginia." Plan of a multi-panel longwall retreat mine, circa 1917. Edge detection has been used to convert the figure to a line
266:
for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and
Switzerland. The creator and year of publication are essential information and must be provided. See
326:
262:
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
47:
43:
37:
92:
60:
340:
315:
263:
436:
The following pages on the
English Knowledge use this file (pages on other projects are not listed):
267:
333:"}},"text\/plain":{"en":{"P571":"June 1917"}}}}": -->
100:
156:
155:
Percentage of
Extraction on of Bituminous Coal with Special Reference to Illinois Conditions,
419:
271:
229:
8:
228:
occurred prior to
January 1, 1929, and if not then due to lack of notice or renewal. See
408:
403:
51:
32:
224:. This applies to U.S. works where the copyright has expired, often because its first
87:
305:
440:
221:
216:
225:
350:
376:
Click on a date/time to view the file as it appeared at that time.
75:
299:
Add a one-line explanation of what this file represents
145:
434:
374:
99:
Commons is a freely licensed media file repository.
330:
65:(768 × 821 pixels, file size: 60 KB, MIME type:
157:Engineering Experiment Station Bulletin No. 100
80:
141:
122:
163:
151:
14:
239:
203:
111:
198:
367:
159:, University of Illinois, page 115.
13:
304:
298:
261:
250:
238:
212:
202:
129:
112:
58:
452:
303:
435:
289:
79:
21:
286:
130:
371:
285:
26:
1:
431:
311:Items portrayed in this file
174:
7:
10:
457:
214:This media file is in the
119:
114:
368:
16:
288:
264:rule of the shorter term
232:for further explanation.
86:This is a file from the
31:
425:
268:Knowledge:Public domain
144:
90:. Information from its
255:
244:
208:
125:RetreatingLongwall.png
93:description page there
36:Size of this preview:
404:15:54, 20 August 2009
254:
242:
206:
272:Knowledge:Copyrights
42:Other resolutions:
256:
245:
209:
429:
297:
283:
282:
276:
274:for more details.
197:
196:
171:
170:
108:
107:
88:Wikimedia Commons
448:
421:Douglas W. Jones
416:
378:
332:
295:
277:
260:
253:
241:
205:
199:
193:
190:
187:
184:
179:
178:
147:
134:
126:
120:
104:
83:
82:
76:
70:
68:
55:
52:768 × 821 pixels
48:449 × 480 pixels
44:224 × 240 pixels
38:561 × 600 pixels
456:
455:
451:
450:
449:
447:
446:
445:
441:Longwall mining
437:
430:
422:
414:
370:
369:
366:
365:
364:
363:
362:
361:
360:
359:
357:
347:
346:
345:
343:
324:
323:
322:
321:
320:
318:
302:
301:
300:
275:
259:
251:
234:
191:
188:
185:
182:
177:
172:
137:
124:
117:
110:
109:
98:
97:
96:is shown below.
72:
66:
64:
57:
56:
41:
12:
11:
5:
454:
444:
443:
433:
428:
427:
424:
420:
417:
411:
406:
401:
397:
396:
393:
390:
387:
384:
381:
373:
358:
355:
353:
352:
351:
349:
348:
344:
339:
337:
336:
335:
334:
328:
319:
314:
312:
309:
308:
307:
306:
294:
293:
290:
287:
281:
280:
278:
257:
247:
246:
236:
210:
195:
194:
176:
173:
169:
168:
165:
161:
160:
153:
149:
148:
143:
139:
138:
127:
118:
116:
113:
106:
105:
84:
74:
73:
35:
30:
29:
24:
19:
9:
6:
4:
3:
2:
453:
442:
439:
438:
423:
418:
412:
410:
407:
405:
402:
399:
398:
394:
391:
388:
385:
382:
380:
379:
377:
354:
342:
338:
317:
313:
310:
291:
284:
279:
273:
269:
265:
258:
249:
248:
243:United States
237:
235:
233:
231:
227:
223:
222:United States
219:
218:
217:public domain
211:
207:Public domain
201:
200:
186:Public domain
183:Public domain
181:
180:
166:
162:
158:
154:
150:
140:
133:
128:
121:
102:
95:
94:
89:
85:
78:
77:
71:
62:
61:Original file
53:
49:
45:
39:
34:
28:
25:
23:
20:
18:
15:
375:
372:File history
215:
213:
131:
101:You can help
91:
59:
22:File history
226:publication
167:C. M. Young
123:Description
432:File usage
413:768 × 821
389:Dimensions
27:File usage
386:Thumbnail
383:Date/Time
356:June 1917
341:inception
331:Gregorian
327:inception
230:this page
175:Licensing
146:June 1917
132:English:
67:image/png
292:Captions
136:drawing.
415:(60 KB)
400:current
395:Comment
316:depicts
296:English
220:in the
115:Summary
63:
164:Author
152:Source
192:false
189:false
392:User
270:and
142:Date
17:File
50:|
46:|
40:.
103:.
69:)
54:.
