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is there a book that explains the DC Universe?

Basically what my question asks, I want to know if there is a book that explains the DC Universe, including about what multiverse's are, the different ages like golden, silver etc, also the different earths and so fourth? I know it can be read here: http://en.wikipedia.org/wiki/DC_Universe but just wondering if there is a book out there that has all of this in?

DC Comics Encyclopedia...

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SHOWCASE COMICS 14 VG VG DC Comics 4th Silver Age Flash    US $711.32

80 pg GIANT 9 THE FLASH DC COMICS 1965 SILVER AGE    US $79.00

ADVENTURE COMICS 268 DC SILVER AGE    US $39.95

AQUAMAN 36 DC COMICS SILVER AGE    US $8.95

BLACKHAWK 219 DC SILVER AGE WAR COMIC BOOK    US $7.95

BLACKHAWK 222 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 214 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 236 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 218 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 239 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 235 DC SILVER AGE WAR COMIC BOOK    US $17.95

BLACKHAWK 224 DC SILVER AGE WAR COMIC BOOK    US $12.95

BLACKHAWK 232 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 221 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 209 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 203 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 233 DC SILVER AGE WAR COMIC BOOK    US $14.95

BRAVE AND THE BOLD 76 1968 DC COMICS BATMAN PLASTIC MAN NICE SILVER AGE    US $29.95

ACTION COMICS 305 DC SILVER AGE SUPERGIRL    US $12.95

ACTION COMICS 426 DC SILVER AGE GREEN ARROW    US $7.95

BLACKHAWK 238 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 223 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 212 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 201 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 200 DC SILVER AGE WAR COMIC BOOK    US $18.95

BLACKHAWK 237 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 207 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 230 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 205 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 206 DC COMICS SILVER AGE WAR    US $8.95

BLACKHAWK 202 DC SILVER AGE WAR COMIC BOOK    US $14.95

BLACKHAWK 206 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 210 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 204 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 216 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 225 DC SILVER AGE WAR COMIC BOOK    US $14.95

ACTION COMICS 314 DC SILVER AGE JUSTICE LEAGUE APP    US $49.95

BLACKHAWK 208 DC SILVER AGE WAR COMIC BOOK    US $11.95

BRAVE AND THE BOLD 74 DC COMICS BATMAN METAL MEN NICE SILVER AGE    US $24.95

BLACKHAWK 211 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 217 DC SILVER AGE WAR COMIC BOOK    US $14.95

BRAVE THE BOLD 47 DC COMIC SILVER AGE STRANGE SPORTS    US $19.95

BRAVE THE BOLD 45 DC COMIC SILVER AGE STRANGE SPORTS    US $29.95

BLACKHAWK 229 DC SILVER AGE WAR COMIC BOOK    US $16.95

BLACKHAWK 213 DC SILVER AGE WAR COMIC BOOK    US $11.95

BLACKHAWK 199 DC SILVER AGE WAR COMIC BOOK    US $14.95

Jimmy Olsen 97 Vintage silver age DC superman comic    US $12.99

Superman comic 188 school for assassins silver age dc    US $12.99

Superman comic 209 monster clark kent dc silver age    US $9.99

Superman comic 225 super devil imposter dc silver age    US $9.99