N – 16 Elements
| 294. Natural Gas |
| 295. Needle |
| 296. New Year Tree |
| 297. New Year Tree With Garland |
| 298. New Year’s Baubles |
| 299. Nightingale |
| 300. Nitric Acid |
| 301. Nitrous Acid |
| 302. No2 |
| 303. Nonruminants |
| 304. Noria |
| 305. Note |
| 306. Nuclear Boiler |
| 307. Nuclear Power Station |
| 308. Nuclear Waste |
| 309. Nuts |
O – 15 Elements
| 310. Oat |
| 311. Observatory |
| 312. Octopus |
| 313. Oil |
| 314. Oil Field |
| 315. Oil Pipeline |
| 316. Oil Refinery |
| 317. Orangery |
| 318. Oranges |
| 319. Orchids |
| 320. Organ |
| 321. Origami |
| 322. Ornithopter |
| 323. Oxygen |
| 324. Oxygen Container |
P – 27 Elements
| 325. Paint |
| 326. Palm Leaves Sandals |
| 327. Palms |
| 328. Panda |
| 329. Paper |
| 330. Paper Factory |
| 331. Peat |
| 332. Pencil |
| 333. Penguins |
| 334. Pigs |
| 335. Pillow |
| 336. Planetarium |
| 337. Planishphere |
| 338. Plankton |
| 339. Platypus |
| 340. Plesiosaurs |
| 341. Plutonium |
| 342. Poisoned Animal |
| 343. Polar Bear |
| 344. Polluted Earth |
| 345. Porcupines |
| 346. Potassium Nitrate |
| 347. Potter’s Wheel |
| 348. Powersaw Bench |
| 349. Pressure |
| 350. Pump |
| 351. Pumpkin |